A ball is allowed to fall from a height of $10\, m$. If there is $40\%$ loss of energy due to impact, then after one impact ball will go up to ......... $m$
A ball is allowed to fall from a height of $10\, m$. If there is $40\%$ loss of energy due to impact, then after one impact ball will go up to ......... $m$
$10 $
$8 $
$4$
$6 $
A ball is allowed to fall from a height of $10\, m$. If there is $40\%$ loss of energy due to impact, then after one impact ball will go up to ......... $m$
$mgh = $ initial potential energy
$mgh' = $ final potential energy after rebound
As $40\%$ energy lost during impact $mgh'=60\%$ of $mgh$
$⇒$ $h' = \frac{{60}}{{100}} \times h = \frac{{60}}{{100}} \times 10 = 6\,m$