First slide

Collisions

Question

A body of mass 40kg having velocity 4 m/s collides with another body of mass 60kg having velocity 2 m/s. If the collision is inelastic, then loss in kinetic energy (in J) will be

Moderate

Solution

Loss in kinetic energy
$= \frac{1}{2} \frac{m_{1} m_{2} {(u_{1} - u_{2})}^{2}}{m_{1} + m_{2}} = \frac{1}{2} (\frac{40 \times 60}{40 + 60}) {(4 - 2)}^{2} = 48 Joule$

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