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A body of mass 2 kg is moving with veloc...

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 coalsces and moves towards northeast. Its velocity is

A

10 m/s

B

5 m/s

C

2.5 m/s

D

`5 sqrt2` m/s

Text Solution

Verified by Experts

The correct Answer is:
D
`m_1 =2kg , u_1 = 10m//s(hati)`
`m_2 =2kg , u_2 = 10m//s(hatj)`
`2xx10hati + 2 xx10hatj =4 xx v`
`implies v = (10 sqrt2)/2 = 5sqrt2 m//s `
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