First slide

The steps in collision

Question

A body of mass 2 kg is moving with velocity 10 m/s towards east, Another body of same mass and same velocity moving towards north collides with former and coalesces and moves towards north-east. Its velocity is

Moderate

A

10 m/s
B

5 m/s
C

2.5 m/s
D

$5 \sqrt{2} m / s$

Solution

Applying the law of conservation of momentum
$p^{2} = p_{1}^{2} + p_{2}^{2} o r (4 v)^{2} = (2 \times 10)^{2} + (2 \times 10)^{2} o r v = 5 \sqrt{2} m / s$

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