Two boys wearing roller skates stand facing each other on a smooth floor

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

Problem

Two boys wearing roller skates stand facing each other on a smooth floor. Boy A has a mass of

40\,\text{kg}

and Boy B has a mass of

60\,\text{kg}

. During a short push, Boy A experiences a force of

30\,\text{N}

for

0.2\,\text{s}

. (i) Force on Boy B (ii) Change in momentum of Boy B