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Q.

At certain height a shell at rest explodes into equal fragments. One of the fragments receives a horizontal velocity u. The time interval after which, the velocity vectors will be inclined at 1200 to each other is

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a

υ3g

b

2υ3g

c

υ23g

d

3υg

answer is A.

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t=2u1u2gcotθ/2=u.ugcot 60=u3g

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At certain height a shell at rest explodes into equal fragments. One of the fragments receives a horizontal velocity u. The time interval after which, the velocity vectors will be inclined at 1200 to each other is