A truck moves at a steady speed on a horizontal road. What is the work done by the road on the truck ?
Answer & explanation
Correct answer: option 3
Work done is given by : \(W = \vec{F}.\vec{S} = FS \cos {\theta}\)
Force applied by the road is the Normal Reaction Force, N which acts upwards. The displacement S is in forward direction.
\(W = N.S \cos {90^o} = zero\)