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A bullet of mass m is fired with a veloc...

A bullet of mass m is fired with a velocity of `50ms^(-1)` at an angle `theta` with the horizontal . At the highest point of its trajectory , it collides head on with a body connected to massless string of length l and gets embedded in the bob of mass 3m. After the collision , the string moves to an angle of `120^@` .What is the angle `theta` ?

A

`cos^(-1)(4/5)`

B

`cos^(-1)(5/4)`

C

`sin^(-1)(4/5)`

D

`sin^(-1)(5/4)`

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The correct Answer is:
A
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