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A rectangular box is sliding on a smooth...

A rectangular box is sliding on a smooth inclined plane of inclination `theta`. At `t=0` the box starts to move on the inclined plane. A bolt starts to fall from point `A`. Find the time after which bolt strikes the bottom surface of the box.

A

`sqrt(((2l)/(gcos alpha)))`

B

`sqrt(((2l)/(gsin alpha)))`

C

`sqrt(((2l)/g))`

D

`sqrt((l/g))`

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