A rock is thrown straight up from the earth's surface. Which one of the following statements concerning the net force acting on the rock at the top of its path is true?
A)The net force is equal to the weight of the rock.
B)The net force is instantaneously equal to zero newtons.
C)The direction of the net force changes from up to down.
D)The net force is greater than the weight of the rock.
E)The net force is less than the weight of the rock, but greater than zero newtons.

Question

Quizplus · Accepted Answer

At the top of its path, the only force acting on the rock is gravity, so the net force is equal to the weight of the rock.

A Rock Is Thrown Straight Up from the Earth's Surface