Question

Question #6a172

Answer 1

`20000N`

Explanation:

Let the ball be moving in the `x` direction with a speed of `100ms^-1`.

After hitting the wall, ball rebounds with the same speed. It implies that velocity is reversed but magnitude remains same.
`:.` Change in momentum `Delta vecp=massxx(vecv_f-vecv_i)`
`Delta |vecp|=2xx(200)=400Ns`
Time for which force is applied `1/50s`
We know that change of momentum`="Force"xx "time"`
`=>Delta vecp=vecFxxtime`,
or `vecF=Delta vecpxx1/(time)`
`=400xx1/(1/50)`
`=20000N`