An object is pulled along a straight line in two stages

PHYSICS · Subjective · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

An object is pulled along a straight line in two stages. Stage 1: a force of

100\,\text{N}

acts over a distance of

30\,\text{cm}

. Stage 2: the same amount of work is done again, but this time the object moves

50\,\text{cm}

under a smaller constant force. Calculate the magnitude of this smaller force.