1. Chapter 2, Part 2 September 5, 2005 (Happy Labor Day)

2. If the velocity of a car is non-zero (v  0), can the acceleration of the car be zero? 1.Yes. 2.No. 3.Depends on Velocity.

3. You throw a ball upward with an initial speed of 10 m/s. Assuming that there is no air resistance, what is its speed when it returns to you? 1.More than 10 m/s. 2.Exactly 10 m/s. 3.Less than 10 m/s.

4. 1.Just after it leaves your hand. 2.At the top of its trajectory. 3.Halfway to the top of its trajectory. 4.Its acceleration is constant. 5.Just before it returns to your hand on the way down. You throw a ball straight up into the air. After it leaves your hand, at what point in its flight does it have the maximum value of acceleration?

5. When throwing a ball straight up, which of the following is true about its velocity v and its acceleration a at the highest point in its path? 1.Both v = 0 and a = 0. 2.v ≠ 0, but a = 0. 3.v = 0, but a ≠ 0. 4.Both v ≠ 0 and a ≠ 0. 5.Not really sure.