“A hockey player hits the ball to another player of his team, who again hits it towards the goal.

The goalkeeper of the opposite team collects the hockey ball and hits it towards a player of his own team”. How many times does the velocity of the ball change?

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answer is D.

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Detailed Solution

The velocity of the ball changes

4

times.
●       The velocity of the ball changes for the 1st time when a hockey player hits the ball on another player on his team. The agent supplying the force, in this case, is the hit by the player.
●       The velocity of the ball changes for the 2nd time when another player of the same team hits the ball toward the goal. Here the force is supplied by the hit of another player.
●       The velocity of the ball changes for the 3rd time when the goalkeeper of the opposite team collects the ball (or stops the ball). In this case, the force is applied by the hands of the goalkeeper.
●       The velocity of the ball changes for the 4th time when the goalkeeper hits the stationary ball toward a player of his own team. Here the force is supplied by the hit of the goalkeeper.

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