Question

a rock is thrown straight up into the air. at the highest point of the rocks path, the magnitude of the net force acting on the rock is (1) less than the magnitude of the rocks weight, but greater than zero (2) greater than the magnitude of the rocks weight (3) the same as the magnitude of the rocks weight (4) zero

Explanation:

When the rock is at the highest point of its path, its velocity is \(0\), but there is still a gravitational force acting on it. According to Newton's second law \(F = mg\) (where \(m\) is the mass of the rock and \(g\) is the acceleration due to gravity), the net force acting on the rock is its weight \(mg\).

Answer:

(3) the same as the magnitude of the rock's weight