Question

Two balls of masses $1\text{kg}$ and $2\text{kg}$ are moving with speeds $2\text{m/s}$ and $5\text{m/s}$ as shown in figure. Find the impulse of deformation of $2\text{kg}$ mass.

• A. $2\text{Ns}$
• B. $-2\text{Ns}$
• C. $0\text{Ns}$
• D. $10\text{Ns}$

Answer 1

The correct option is C $0\text{Ns}$


Given,
$m_1=1\text{kg};m_2=2\text{kg}$
$u_1=2\text{m/s};u_2=5\text{m/s}$

Impulse of deformation of $2\text{kg}$
$J_d=m_2(v-u_2$) (where $v$ is common velocity)

However, these two balls willl never be in contact since $u_2>u_1$
So, $J_d=0$