Which would hit the ground first if dropped from the same height in a vacuum—a feather or a metal bolt?

Answer: They would hit the ground at the same time

A baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the mitt. At what point in the ball's path does it experience zero velocity and nonzero acceleration at the same time?

Answer: at the top of its path

Which of the following statements applies to the motion of a ball rising and then falling in free fall?

I. The ball has constant acceleration as it moves upward.

II. The ball has constant acceleration at the top of its path.

III. The ball has constant acceleration as it moves downward.

Answer: I, II, and III

Acceleration due to gravity is also called

Answer: free-fall acceleration

When a car's velocity is negative and its acceleration is negative, what is happening to the car's motion?

Answer: The car speeds up

When a car's velocity is positive and its acceleration is negative, what is happening to the car's motion?

Answer: The car slows down

If you know the acceleration of a car, its initial velocity, and the time interval, which of the following can you predict?

the direction of the car's final velocity

the magnitude of the car's final velocity

the displacement of the car