Question

A construction worker is carrying a load of 40 kilograms over his head and is walking at a constant velocity. If he travels a distance of 50 meters, how much work is being done?

A. 0 joules
B. 2.0 × 102 joules
C. 2.0 × 103 joules
D. 1.9 × 104 joules ...?

Answer 1

In physics, a force is said to do work if, when acting, there is a displacement of the point of application in the direction of the force. It is expressed as:

W = F x d
W = m x a x d
W = 40 x 0 x 50 = 0 J

Acceleration is zero because it is at a constant velocity. Therefore, the correct answer is option A.