On the Surface of the Moon, a Ball Is Thrown

Multiple Choice

On the surface of the Moon, a ball is thrown straight up with an initial velocity. The ball has a constant acceleration due to the Moon's gravity.On a graph of the ball's velocity versus time, which of the following would represent the ball at its highest point above the Moon's surface?

A) when the velocity is equal to 0 m/s
B) when the velocity is equal to 1.6 m/s
C) when the velocity has its greatest value
D) when the velocity has its most negative value