1. Suppose a free-fall ride at an amusement park starts at rest and is in free fall. What is the velocit of the ride after 2.3 s? How far do people on the ride fall during the 2.3-s time period?
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- Q11. The position of an object moving along an x-axis is given by x = 3 + 12t - t, where x is in meters and t is in seconds. At what time is the particle momentarily at rest?1. At time t = 0.0 s, a steel ball is thrown vertically downwards from the top of a tall tower with a velocity of 2.0 m/s. = 3.0 s. 2.0 s and t = Calculate the distance it falls between the period of t (You may ignore air resistance. Take the acceleration due to gravity to be 10.0 m/s.)A cargo ship makes a short run between two docks: one in Mock Town. The other is in Logue Town. As the ship approaches Logue Town, (traveling in the positive direction), its speed is 7.4 m/s. As the ship goes back to Mock Town, its speed is 7.3m/s. If it comes with rest in 13.1s, what is its average acceleration? a. 0.60 m/s2 b. -0.60 m/s2 c. 0.56 m/s2 d. -0.56 m/s2
- 9. An object initially at rest experiences an acceleration of 2.00 m/s2 for 5.50 s then travels at that constant velocity for another 8.60 s. What is the magnitude of the object's average velocity over the 14.1 s interval? m/s 60 ssfor 60 ssfo sfo ssf60 s.A truck starts from rest at t = 0 and reaches a final speed v at time t. Which of the following statements is/are true if the acceleration of the of the truck is constant (and nonzero) during this time? The car travels a distance vt. The average speed of the car is v/2. The magnitude of the acceleration of the car is v/t. The velocity of the car remains constant.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?
- 4. You throw your keys straight up into the air. At each of the following instants, is the key's acceleration g, - g, 0, g? a. Just after leaving your hand? b. At the very top (maximum height)? c. Just before hitting the ground?+6. K13Q6 - 7. K13Q7 A sports car traveling at 29.5 m/s slows to a velocity of 11.0 m/s over 11.1 s. How far does it move during this time? X Distance 430.08 m InfoA spring gun that is mounted at the edge of a 2.0-m-high table launches a steel ball at an angle of 230 above the horizontal with an initial speed of 7.0 m/s. What is the total time of flight of the steel ball? (Assume that g = 9.81 m/s2.) a. 0.80 s b. 0.60 s c. 0.40 s d. 1.0 s e. 1.2 s
- 21. A 50.0-g Super Ball travel- ing at 25.0 m/s bounces off a brick wall and rebounds at -3-- Figure P2.20 22.0 m/s. A high-speed camera records this event. If the ball is in contact with the wall for 3.50 ms, what is the magnitude of the average acceleration of the ball during this time interval?2. A jet plane has a takeoff speed of vtakeoff = 73 m/s and can move along the runway at an average acceleration of 2.4 m/s2. The runway is 1.2 km. Write out the 3 Kinetic equations. a. b. Write out the values of initial position, initial velocity, and acceleration. How many seconds will it take for the plane to reach takeoff speed? с. d. How far will the plane have to travel to get to takeoff speed? will the plane be able to get to take off before it gets to the end of the runway? е.1. A ball is thrown vertically upward from the ground with a speed of 36.0 m/s. Suppose the acceleration of gravity were only 2.00 m/s² instead of 9.80 m/s² a) At what time after being thrown does the ball have a velocity of 12.0 m/s upward? b) At what time does it have a velocity of 12.0 m/s downward? c) When is the velocity of the ball zero? d) When is the displacement of the ball zero? e) What are the magnitude and direction of the acceleration while the ball is moving upward? f) What are the magnitude and direction of the acceleration while the ball is moving downward? g) What are the magnitude and direction of the acceleration when it is at the highest point?