Question

What is the work done by a person pushing a rock which is unmoved?

• A. Negative work
• B. Positive work
• C. Zero work
• D. Work done cannot be defined

Answer 1

The correct option is C Zero work

We know that the mathematically work done is given by W = F $\times$ S $\times$ cos $\theta$, where F is the force applied, S is the displacement of the object and $\theta$ is the angle between force and displacement. In this case the rock is unmoved which means the displacement is zero.
Hence work done is zero for this case