You are throwing a ball straight up in the air. At the highest point, the ball\'

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You are throwing a ball straight up in the air. At the highest point, the ball's velocity and acceleration are zero. velocity is nonzero but its acceleration is zero. acceleration is nonzero, but its velocity is zero. velocity and acceleration are both nonzero. A uniform meterstick is balanced as shown in the figure below with rock attached to the left end of the stick. (Pay attention to the scale of the diagram.) What is the mass of the meterstick? 36 0.6 1.2 1.8 In a common physics demonstration, two identical carts having rigid metal surfaces and equal speeds collide with each other. Each cart has a piece of V attached to the end of a spring. Which of the following are always true? The collision is inelastic The collision is elastic Momentum is conserved Momentum is not conserved kinetic energy is conserved kinetic energy is not conserved I. and VI. only II. and IV only I. IV., and VI. I. III., only I. III., and VI. problems (5-7) Two identical objects are pressed against two different springs so that each spring the same potential energy. The objects are then released from rest. One spring is quite stiff(hard compress). While the other one is quite flexible. Consider the following statements:

Explanation / Answer

12-C , V =0 and a is nonzero

13-not clearly visible

14-E

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