Question

Particle 1 collides a stationary particle 2 head on elastically. Find their mass ratio collision they move in opposite direction with equal velocities.

• A. 1
• B. 1/2
• C. 1/3
• D. 1/4

Answer 1

Answer: (C)

1/3

Answer 2

$\frac{v_{1}}{v_{2}} = \frac{\left( m_{1} - m_{2} \right)u_{1} + 2m_{2}u_{2}}{\left( m_{2} - m_{1} \right)u_{2} + 2m_{1}u_{1}}$

or - 1 = $\frac{\left( m_{1} - m_{2} \right)u}{2m_{1}u}or\frac{m_{1}}{m_{2}} = \frac{1}{3}$.