Solution: A ball is thrown into the air, directly upward. If it feels no air resistance, which of the following statements is true: a) The acceleration of the ball points downward while the ball travels upwards, and upward while the ball falls. b) The acceleration of the ball points upward while the ball travels upwards, and upward while the ball balls. c) The acceleration of the ball points downward while the ball travels upwards, and downward while the ball falls. d) The acceleration of the ball points downward while the ball travels upwards, and upward while the ball falls.

Problem

A ball is thrown into the air, directly upward. If it feels no air resistance, which of the following statements is true:

a) The acceleration of the ball points downward while the ball travels upwards, and upward while the ball falls.

b) The acceleration of the ball points upward while the ball travels upwards, and upward while the ball balls.

c) The acceleration of the ball points downward while the ball travels upwards, and downward while the ball falls.

d) The acceleration of the ball points downward while the ball travels upwards, and upward while the ball falls.