A ball of mass 0.5kg moving with a velocity of 2m/sec strikes a wall normally and bounces back with the same speed. If the time of contact between the ball and the wall is one millisecond, the average force will be

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A ball of mass 0.5kg moving with a velocity of 2m/sec strikes a wall normally and bounces back with the same speed. If the time of contact between the ball and the wall is one millisecond, the average force will be

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125 N

2000 N

5000 N

1000 N

answer is A.

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Detailed Solution

$F = \frac{m v - (- m v)}{t} = \frac{2 m V}{t} = \frac{2 \times 0.5 \times 2}{1 \times 10^{- 3}} = 2000 N$

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