A boy of mass standing on a smooth horizontal surface pushes a girl of mass who is…

PHYSICS · Single correct · CBSE · Physics · Laws of Motion · Laws of Motion

Problem

A boy of mass

50\,\text{kg}

standing on a smooth horizontal surface pushes a girl of mass

40\,\text{kg}

who is standing at rest on roller skates. After the push, the boy moves backward with a speed of

0.6\,\text{m/s}

. What is the girl's speed immediately after the push? (a)

0.67\,\text{m/s}

forward (b)

0.75\,\text{m/s}

forward (c)

0.48\,\text{m/s}

forward (d)

0.60\,\text{m/s}

forward