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))`

`40sqrt(3)`

`20sqrt(3)`

`10sqrt(3)`

`60sqrt(3)`

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