Question

A force of 40 N acts on body of mass 5 Kg. What is the amount of work done if the total displacement is 2 m and is in the direction of the force applied?

(a) 80 J

(b) -80 J

(c) 40 J

(d) 16 J

The question was posed to me by my school teacher while I was bunking the class.

My question is taken from Work in section Work, Energy and Power of Physics – Class 11

Answer 1

The correct choice is (a) 80 J

Best explanation: The work done on a body is obtained by calculating the dot product of the force and displacement vector. Since the displacement is in the direction of the applied force, the work done is positive and is equal to 80 J.