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In the arrangement shown in fig., at a p...

In the arrangement shown in fig., at a particular instant, the roller is coming down with a speed of `12ms^(-1)` and C is moving up with `4ms^(-1)`. At the same instant, it is also known that w.r.t. pulley P, block A is moving down with speed `3ms^(-1)` . Determine the motion of block B (velocity ) w.r.t. ground.

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