A person applies a constant force on an object of mass 20 kg that causes the object to move horizontally at a constant speed of 0.20 m/s through a distance of 0.80 m. What is the work done on the object?
A) 160 J
B) 10 J
C) 16 J
D) 0 J
E) Cannot be determined without knowing the magnitude of the applied force.

Question

Quizplus · Accepted Answer

Work done on an object is given by the product of force and the displacement of the object in the direction of the force. In this case, the object is moving at a constant speed, which means that there is no acceleration and hence no net force acting on the object. Therefore, the work done on the object is zero.

A Person Applies a Constant Force on an Object of Mass