A rock is thrown vertically upward. At the top of its straight-line path the force acting on it is
A)zero.
B)only the force due to gravity.
C)due to air resistance.
D)both due to gravity and air resistance.

Question

Quizplus · Accepted Answer

At the top of its straight-line path, the velocity of the rock becomes zero, which means that the net force acting on the rock is zero. Therefore, the only force acting on the rock at the top of its path is the force due to gravity, as air resistance is negligible at this point.

A Rock Is Thrown Vertically Upward