Which of the following best describes an object that is accelerating? A. An air hockey puck glides across the table without slowing down. B. A test car smashes into a wall. C. An ocean swell moves across the surface of the water at a constant velocity. D. A cricket sits chirping its night time song.

Which of the following situations describes zero acceleration?   a. a rock falling from a cliff b. a toy car coming to a stop as it rolls onto a rocky path c. a cannonball being shot into the air d. a wagon rolling at a constant velocity of 4 m/s

5. Two rocks are thrown horizontally off a 180 m cliff. One rock is thrown with a speed of 10 m/s and the other is thrown with a speed of 20 m/s a. How much time does it take each rock to hit the ground? b. How far from the base of the cliff does each rock land? c. What is the horizontal and vertical speed of each rock when it hits the ground?

Which of the following descriptions corresponds to a ball tossed vertically upward? Air resistance can be neglected. a. The velocity decreases linearly from v_0 to v_f, with v_0>0 and v_f<0. b. The velocity increases linearly from zero to v_f. c. The position first increases linearly and then decreases linearly as a function of time. d. The acceleration decreases linearly from g to zero.

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.

The figures show nine graphs of position, velocity, and acceleration for objects in linear motion. Pay attention to the graph's units. Indicate the graphs that meet the following conditions:Velocity is constant A. A B. B C. C D. D E. E F. F G. G H. H I. I J. All of the above K. None of the above Velocity has reversed direction A. A B. B C. C D. D E. E F. F G. G H. H I. I J. All of the above K. None of the above Acceleration is constant A. A B. B C. C D. D E. E F. F G. G H. H I. I J. All of the above K. None of the above

A ball is thrown straight upward from a height of 3.2 m with a velocity of 13.0 m/s. a. What is the maximum height the ball reaches? b. How long does it take the ball to reach the maximum height? c. What is the total time the ball is in the air? d. With what velocity does the ball impact the surface?

Which of the following are examples of velocities? a. +54 m/s. b. 60 miles/hour. c. 70 miles/hr northeast. d. -100 m/s. e. 20 knots. f. a, c, d. g. b, e.

An automobile is going around a circle with a constant speed of 25mph. Choose the correct statement . Choose all that apply.   a. Velocity is changing.(not constant)   b. Automobile is accelerating .   c. Velocity of the automobile is constant.   d. Acceleration of the automobile is zero.

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