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A ball of mass m moves with speed v and ...

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

`(2mv)/t`

B

`(mv)/t`

C

mvt

D

`(mv)/(2t)`

Text Solution

Verified by Experts

The correct Answer is:
A
Initial velocity of a ball =v
When ball strikes the wall normally it referces back, then final velocity = -v
Change in velocity `DeltaV = v -(-v) = 2v`
Force exerted by the ball on the wall is given by
Newton's second law,
i.e., `F = ma = (mDeltav)/(Deltat) =(m2v)/t = (2mv)/t`
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