11. You toss a ball straight up in the air. At the highest point, the ball\'s: A

Question

11. You toss a ball straight up in the air. At the highest point, the ball's:

A. velocity is zero and the acceleration is upward.

B. velocity and acceleration are zero.    

C. acceleration is zero but not its velocity.

D. velocity is zero and the acceleration is downward.

12. A 10 kg object dropped from a certain window strikes the ground in 2.0 s. Neglecting air resistance, a 5 kg object dropped from the same window strikes the ground in:

A. 8.0 s.

B. 4.0 s.    

C. 2.0 s.

D. 1.0 s.

13. The acceleration of a body is given by the slope of a graph plotting:

A. time versus displacement.

B. displacement versus time.    

C. velocity versus displacement.

D. velocity versus time.

E. time versus velocity.

14. In a laboratory on Earth, all the air is pumped from a large tube. A feather and a steel ball are simultaneously released from rest inside the tube. What happens next?

A. Both objects fall and hit the bottom at the same time

B. The steel ball falls and hits the bottom before the feather    

C. Both objects float weightless inside the tube

D. The feather falls and hits the bottom before the steel ball

15. In order to find the depth of a well, you drop a stone into it and time its fall. It hits the water after falling for 2 s. The depth of the well is about:

A. 20 m.

B. 10 m.    

C. 40 m.

D. 2 m.

Explanation / Answer

D

C

D

C

A

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