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Question: A ball of mass m moves with speed v and it strikes normally with a wall and reflected back normally,...

A ball of mass m moves with speed v and it strikes normally with a wall and reflected back normally, if its time of contact with wall is t then find force exerted by ball on wall

A

2mvt\frac{2mv}{t}

B

mvt\frac{mv}{t}

C

mvtmvt

D

mv2t\frac{mv}{2t}

Answer

2mvt\frac{2mv}{t}

Explanation

Solution

For exerted by ball on wall

= rate of change in momentum of ball

= mv−(−mv)t=2mvt\frac{mv - ( - mv)}{t} = \frac{2mv}{t}