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 the wall

Question

Dr. Abubacker · Accepted Answer

(a) Initial velocity of ball $= v$
When it strikes the wall normally and reflected back, then final velocity $= - v$
Change in velocity $= v—v = 2v$
Force exerted by the ball on the wall is given by Newton’s second law, $ie,$
$F = ma$
$= \frac{m\ \mathrm{\Delta}v}{\mathrm{\Delta}t}$
$= \frac{m(2v)}{t} = \frac{2\ mv}{t}$

Q. 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 the wall

Explanation

Reviewed by Dr. Abubacker

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