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When a body of mass m(1) moving with uni...

When a body of mass `m_(1)` moving with uniform velocity `40 ms^(-1)` collides with another body of mass `m_(2)` at rest, then the two together begin to move with uniform velocityof `30 ms^(-1)`. The ratio of the masses (i.e. `m_(1)//m_(2)`) of the two bodies will be

A

`tan theta_(1) = ( sin theta)/( cos theta + m_(2) //m_(1))`

B

`tan theta_(1) = ( sin theta)/( cos theta + m_(1) //m_(2))`

C

`tan theta_(1) = ( cos theta)/( sin theta + m_(2) //m_(1))`

D

`tan theta_(1) = ( cos theta)/( sin theta + m_(1) //m_(2))`

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The correct Answer is:
B
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