Question

A ball falls from a height of 10m on to a horizontal plane. if the coefficient 0. restitution is 0.6. the height to which it rebounds after 2 collision is approximate.

• A. $2.24m$
• B. $0.47m$
• C. $0.3m$
• D. $1.296m$

Answer 1

The correct option is D $1.296m$

Given,

$h=10m$

$e=0.6$

$n=2$

The height to which a ball rebound after the $n$ collision,

$h^{\prime }=e^{2n}h$

$h^{\prime }={0.6}^4\times 10=1.296m$

The correct option is D.