A stalled car is being pushed up a hill at constant velocity by three people.The net force on the car is
A) zero.
B) up the hill and equal to the weight of the car.
C) down the hill and equal to the weight of the car.
D) up the hill and greater than the weight of the car.
E) down the hill and greater than the weight of the car.

Question

Quizplus · Accepted Answer

Since the car is being pushed at a constant velocity, the net force on the car must be zero according to Newton's first law of motion. This means that the force applied by the three people pushing the car up the hill is equal and opposite to the force of friction and air resistance acting against the car. Thus, the net force on the car is zero.

A Stalled Car Is Being Pushed Up a Hill at Constant