Question

Question number 9 please guys..

Answer 1

is the right answer is .72 m

Answer 2

$<b><i>$
Coefficient of Restitution $e^{n} =\sqrt{\frac{h_{n}}{h}}$

Here, n is 1 , only for first collision
$e^{1} =\sqrt{\frac{h_{1}}{h}}$

Squaring on both sides

$e^{2} = \frac{h_{1}}{h}}$

=>$h_{1} = e^{2}×h$

Given,
h = 2 m
e = 0.6

$h = (0.6)^{2}×0.6$

=> h = 0.36×2
=> h = 0.72 m

So The Ball will rebound to the height of $0.72\: m$