A football of mass is moving at towards a goalkeeper

PHYSICS · Subjective · CBSE · Physics · Laws of Motion · Laws of Motion

Problem

A football of mass

0.50\,\text{kg}

is moving at

20\,\text{m\,s}^{-1}

towards a goalkeeper, who brings it to rest. (i) If the ball is stopped in

0.040\,\text{s}

, calculate the average force exerted on the goalkeeper’s hands. (ii) The goalkeeper now pulls his hands back so that the ball is stopped in

0.10\,\text{s}

. Calculate the new average force.