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A body is thrown vertically up with some...

A body is thrown vertically up with some velocity (at `t=0` ) crosses a fixed point `P` in its path at `t=4s` and again at `t=6s`.The velocity of projection of the body will be
(1) `20m/s`
(2) `50m/s`
(3) `10m/s`
(4) `40m/s`

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