6. Neglecting friction, if a Cadillac and Volkswagen start rolling down a hill t

Question

6. Neglecting friction, if a Cadillac and Volkswagen start rolling down a hill together, the heavier Cadillac will get to the bottom:

A. before the Volkswagen.

B. at the same time as the Volkswagen.    

C. after the Volkswagen.

7. The motion of a falling object is commonly investigated with the aid of a:

A. kaleidoscope.

B. stroboscope.    

C. stethoscope.

D. microscope.

8. Suppose you throw a ball vertically upward with a speed of 49 m/s. Neglecting air friction, what would be the speed of the ball one second later?

A. 49 m/s

B. 32 ft/s2    

C. 18 m/s

D. 39.2 m/s

E. 10 m/s

9. If you drop a ball in the absence of air resistance, it accelerates downward at 9.8 m/s2. If instead you throw the ball upward, then its acceleration after release is

A. less than 9.8 m/s2.

B. greater than 9.8 m/s2.    

C. equal to 9.8 m/s2.

A ball is thrown straight up. It reaches its highest point and then falls back. Which of the following is the correct statement?

A. Throughout its motion, the ball's velocity is zero.

B. At the highest point in its motion, the ball's velocity and acceleration are zero.    

C. At the highest point in its motion, the ball's velocity is zero.

D. Throughout its motion, the ball's acceleration is zero.

E. At the highest point in its motion, the ball's acceleration is zero.

Explanation / Answer

B

B

D

C

C

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