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

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4-1.Newton's Laws of Motion

easy

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

$\frac{{2mv}}{t}$

B

$\frac{{mv}}{t}$

C

$mvt$

D

$\frac{{mv}}{{2t}}$

Solution

(a) For exerted by ball on wall = rate of change in momentum of ball

= $\frac{{mv – ( – mv)}}{t} = \frac{{2mv}}{t}$

Standard 11

Physics

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(IIT-2018)