You throw a ball straight up. Compare the sign of the work done by gravity while the ball goes up with the sign of the work done by gravity while it goes down.
A) Work up is +, and the work down is -.
B) Work up is -, and the work down is -.
C) Work up is +, and the work down is +.
D) Work up is -, and the work down is +.

Question

Quizplus · Accepted Answer

When the ball is thrown up, gravity does negative work because the force of gravity (downward) is opposite to the direction of motion (upward). When the ball comes down, gravity does positive work because the force of gravity and the direction of motion are the same (both downward).

You Throw a Ball Straight Up