Question

A heavy truck moving with a velocity of $60km{h}^{-1}$ collides with a light drum at rest. If the collision be elastic, then the velocity of the drum immediately after collision will be

Answer 1

Given that,

Before collision,

$u_1=60Km/h$

$u_2=0$

We know that,

After collision, When $m_1>>m_2$ in elastic collision

then,

$v_1=u_1$ and $v_2=2u_1-u_2$

Now,

$v_2=2\times 60-0$

$v_2=120km/h$

Hence, the velocity of the drum after collision is 120 km/h.