Q15 A spear is launched at 45o to the horizontal from a high cliff. The spear lands at 60o horizontal below the cliff. The spear reaches a maximum height after 1.5 seconds. What is the total time of flight for the spear? (A) 1.5 s (B) 3.0 s (C) 4.1 s (D) 4.7 s
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- 1. A projectile remains in the air for 6.00 s after it is fired. The horizontal component of its velocity is 100 m/s. (a) How far did it move forward before it hit the ground? (b) How long after firing did it reach the highest point of its path? (c) What was the altitude of the highest point in its path?Max first shoots a nerf ball up into the air from the top of a building that is 225 meters high on Earth with an initial velocity of +17.5 m/s. Petra is halfway down the building looking out of a window. How high does the ball go in the air above max?Two 47. identical pellet guns are fired simultaneously from the edge of a cliff. These guns impart an initial speed of 30.0 m/s to each pellet. Gun A is fired straight upward, with the pellet going up and then falling back down, eventually hitting the ground beneath the cliff. Gun B is fired straight downward. In the absence of air resistance, how long after pellet B hits the ground does pellet A hit the ground? 48. mmh An astronaut on a distant planet wants to determine its accel- eration due to gravity. The astronaut throws a rock straight up with a ve- locity of +15 m/s and measures a time of 20.0 s before the rock returns to his hand. What is the acceleration (magnitude and direction) due to gravity on this planet? I 52. A ball is thrown straight upward. At 4.00 m above its launch point, the ball's speed is one-half its launch speed. What maximum height above its launch point does the ball attain? 53. ssm From her bedroom window a girl drops a water-filled balloon to the ground,…
- 1. A ball is thrown into the air with an initial x velocity of 15 m/s and an initial y velocity 10 m/s from an initial height of 20 m. a) What is the maximum height of the ball? How long does it take the ball to reach its maximum height? b) What is the range of the ball?#4You have two stones in your hands, and you are standing on a bridge. You throw the first stone with a velocity of 8.00 m/s upward. One second later, you let drop the second stone. Both stones hit the water below the bridge at the same time. a)For how much time is the first stone in free fall? b)What is the distance from your hand to the water? c) What is the velocity (magnitude and direction) of the first stone when it hits the water?
- A horizontal projectile is fired and it takes 4 s to reach the ground after being launched from the top of a hill. a) What is the height of the cliff? b) What horizontal distance does it travel from the launching point to the impact point? The initial speed is 20 m/sYou are traveling in a convertible with the top down. The car is moving at a constant velocity of 14.7 m/sdue east along flat ground. You throw a tomato straight upward at a speed of 6.76 m/s. How far has the car moved when you get a chance to catch the tomato?6.
- 7. The height of a helicopter above the ground is given by h =20.0 t-5.0 t where h is in meters and t is in seconds. At t=1.00 s, the helicopter releases a small mailbag. a) What is speed of a mailbox before hint to the ground? b) How long mailbox in air? 8. Starting from rest at 5 m from origin, a small still ball's horizontal component of velocity is 90.0 mile/hour in a straight line in 10.0 s. Ball's acceleration is constant during the entire motion, what is ball's final position?A projectile is fired from a gun and has an initial vertical velocity equal to 30 m/s. What is the acceleration of the projectile when it reaches its maximum height? Its magnitude is 9.8 m/s2 and; its direction is changing. 9.8 m/s?, downward O m/s2 less than 9.8 m/s-but non-zero. 4.9 mm/s?, downward4. You wake up in a strange room, with opaque walls, and no visible doors or windows. you drop a ball from a height of 1.12 m and it hits the floor 0.191 s after you drop it. This time you suspect you are on a rocket that has just left the surface of the Earth, and is still not too far above the ground. What do you deduce the rocket s acceleration to be? 71.2 m/s^2 61.4 m/s^2 98.0 m/s^2 51.6 m/s^2