Q.

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

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a

10 m/s

b

5 m/s

c

2.5 m/s

d

52 m/s

answer is D.

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Detailed Solution

Applying the law of conservation of momentump2=p12+p22 or (4v)2=(2×10)2+(2×10)2 or v=52m/s
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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