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- The lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net (see the drawing). Suppose that you loft the ball with an initial speed of 15.0 m/s at an angle of 50.0⁰ the horizontal. At this instant your opponent is 10.0 m away from the ball. He begins moving away from you 0.32 s later, hoping to reach the ball and hit it back at the moment that it is 2.10 m above its launch point. With what minimum average speed must he move? (Ignore the fact that he can stretch, so that his racket can reach the ball before he does.) Number 15.0 m/s 50.0° Units 10.0 m 2.10 mQUESTION 8 A projectile is fired from the ground, reaches a maximum height of 37.4 m and lands a distance of 73.9 m away from the launch point. What was the projectile s launch velocity? A 30.2 m/s, 63.7 degrees above horizontal B 27.1 m/s, 31.9 degrees above horizontal C 13.4 m/s, 38.2 degrees above horizontal D 51.3 m/s, 19.1 degrees above horizontal QUESTION 9 You launch a projectile toward a tall building, from a position on the ground 35.4 m away from the base of the building. The projectile s initial velocity is 67.5 m/s at an angle of 46.3 degrees above the horizontal. At what height above the ground does the projectile strike the building? A 76.2 m B 61.0 m C 19.2 m D 34.2 m QUESTION 10 You launch a projectile horizontally from a building 30.7 m above the ground at another building 49.1 m away from the first building. The projectile strikes the second building 6.4 m above the ground. What…9. You are a basketball player shooting a three-point shot. You are standing 10.0 m from the basket, which is 3.0m above the floor. You jump up and shoot the ball, releasing the ball when your hands are at the same height as the basket (3.0 m). You release the ball with an initial velocity va, at an angle 0 = 42° from the horizontal. The ball goes in! Your team wins! VA V=0, 3 m + distace 10 m a. What was the initial velocity of the ball? (Show your work, put a box around your answer.) Ax = 10m Ay=3M A=-9.0'0² V6+2(98) ( Vo 14m/3)X b. What maximum height above the FLOOR was reached by the ball? (Show your work, put a box around your answer.). V= Vo°+ 2A (A4) +219.8)(Y-0) O 14f -19.664-0 196 =19.6y = )8m 14 = Vot Vot use Vy acce krahom c. If you wanted to decrease the required initial velocity on the ball, would you increase or decrease the initial angle from the horizontal? Check one: increase the angle decrease the angle Version B 3. Page 6 of 8
- 8. A person kicks a ball such that it leaves the ground with an initial velocity of 20.0 m/s at an angle of 53.0° above the horizontal. The ball travels 36.0 meters horizontally where it clears a bar that is 3.05 meters above the ground. (a) By what distance does the ball clear the bar? (b) What is the velocity in the y- direction of the ball when directly above the bar? Answers: (a) 0.85 m (b) -13.4 j m/sttempt 11 Robin would like to shoot an orange in a tree with his bow and arrow. The orange is hanging yf = 5.00 m above the ground. On his first try, Robin releases the arrow at vo = 32.0 m/s at an angle of 0 = 30.0° above the horizontal. The arrow has an initial height of yo = 1.30 m, and its tip is x = 48.0 m away from the target orange. Treating the arrow as a point projectile and neglecting air resistance, what is the height of the arrow once it has reached the horizontal position x of the orange? Use g = 9.81 m/s? for the acceleration due to gravity. height of the arrow: IncorrectThe lob in tennis is an effective tactic when your opponent is near the net. It consists of lofting the ball over his head, forcing him to move quickly away from the net (see the drawing). Suppose that you loft the ball with an initial speed of 15.0 m/s at an angle of 50.0° the horizontal. At this instant your opponent is 10.0 m away from the ball. He begins moving away from you 0.45 s later, hoping to reach the ball and hit it back at the moment that it is 2.10 m above its launch point. With what minimum average speed must he move? (Ignore the fact that he can stretch, so that his racket can reach the ball before he does.) 15.0 m/s 2.10 m 50.0 10.0 m Number i Units
- ab 3. Three projectiles (A, B, and C) are launched with different initial speeds so that they reach the same maximum height, as shown in the figure. List the projectiles in order of increasing initial speed (smallest v; written in the first blank). у thenA physics student stands on a cliff overlooking a lake and decides to throw a softball to her friends in the water below. She throws the softball with a velocity of 24.5 m/s at an angle of 31.5° above the horizontal. When the softball leaves her hand, it is 12.5 m above the water. How far does the softball travel horizontally before it hits the water? Neglect any effects of air resistance when calculating the answer. Macmillan Learning horizontal distance: EAsap please
- In the Marvel comic series X-Men, Colossus would sometimes throw Wolverine toward an enemy in what was called a fastball special. Suppose Colossus throws Wolverine at an angle of 0 = 23.0° with respect to the ground (see figure below). Wolverine is d = 2.14 m above the ground when he is released, and he leaves Colossus's hands with a speed of v; = 22.6 m/s. d (a) Using conservation of energy and the components of the initial velocity, find the maximum height attained by Wolverine during the flight. m (b) Using conservation of energy, what is Wolverine's speed the instant before he hits the ground? m/sA rescue plane drops a box of relief goods to the flood survivors. The plane is travelling horizontally at 42 m at a - S height of 0.120 km above the ground. Where will the box hit the ground relative to the initial position where it was released?When the dried-up seed pod of a scotch broom plant bursts open, it shoots out the seed with an initial velocity of 2.69 m/s at an angle of 63.5∘ above the horizontal.A: If the seed pod is 0.455m above the ground, how long does it take for the seed to land?B: What horizontal distance does it cover during its flight?