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A particle of mass m is projected at an ...

A particle of mass m is projected at an angle of `60^(@)` with a velocity of `20m//s` relative to the ground from a plank of same mass m which is placed on smooth surface Initially Plank was at rest The minimum length of the plank for which the ball will fall on the plank itself is `(g=10m//s^(2))`

A

`40sqrt(3)`

B

`20sqrt(3)`

C

`10sqrt(3)`

D

`60sqrt(3)`

Text Solution

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The correct Answer is:
A
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