A gardener pushes a lawn-mower by applying a steady horizontal force of

PHYSICS · Multi-part · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

250\,\text{N}

. The motor of the mower delivers a constant power output of

1.5\,\text{kW}

. (a) Calculate the constant speed at which the mower can move. Give your answer in

\text{m s}^{-1}

. (b) Convert this speed to

\text{km h}^{-1}

, writing your answer correct to one decimal place.