A constant horizontal force of acts separately on two balls, A and B

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

Problem

A constant horizontal force of

10\,\text{N}

acts separately on two balls, A and B, each starting from rest on a smooth horizontal table. The force acts through a displacement of

5\,\text{m}

on both balls. The mass of ball A is

1\,\text{kg}

and that of ball B is

4\,\text{kg}

. (i) Find the work done on each ball by the applied force. (ii) Calculate the final speed of each ball after the

5\,\text{m}

displacement. (iii) Which ball gains more kinetic energy? Give a reason for your answer based on your calculations.