Question

A goalkeeper in a game of football pulls his hands backwards after holding the ball shot at the goal. This enables the goalkeeper to :

• A. exert a large force on the ball.
• B. increase the force exerted by the ball on hands.
• C. increase the rate of change of momentum
• D. decrease the rate of change of momentum.

Answer 1

The correct option is D decrease the rate of change of momentum.

According to newton’s second law,

$F=m\frac{(v-u)}{t}$

So, by pulling his hands backwards, the goalkeeper increases time to hold the ball. By increasing the time,he decreases the force (rate of change of momentum) applied by the football on him.