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A block of mass m in floating in a river...

A block of mass `m` in floating in a river flowing with a velocity of `2m//s`.A boat is moving behind the block with a velocity of `5m//s` with respect to the block as shown.From the boat a stone is thrown with a velocity `vecv=v_(1)hati-v_()hatj+v_(3)hatk` with respect to the river such that it hits the block.If `v_(1):v_(2):v_(3)=2sqrt3:2:3` then the velocity of the stone with respect to the ground is `(g=10m//s^(2))`

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