Question

A hammer of mass $1$ kg moving with a speed of $6$ $m/s$ strikes a wall and comes to rest in $0.1sec$. Calculate :
1. An impulse of the force.

2. An average retarding force that stops the hammer.

3. Average retardation of the hammer.

Answer 1

Mass of the hammer=$1kg$

Initial velocity$\left(u\right)$=$6m{s}^1$

Final velocity$\left(v\right)=0m{s}^1$

Tie taken$\left(t\right)=0.1sec$

$\left(i\right)$

impluse=$m(v-u)=1\times (0-6)$

$=>-6m{s}^1$

$\left(ii\right)$

a retarding force that stops a hammer

i.e.,

$f=\frac{impluse}{time}=\frac{-6}{0.1}$

$=>60N$

$\left(iii\right)$

retarding of the hammer

i.e.,

$a=\frac{f}{m}=\frac{60}{1}=60m{s}^{-}2$