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A block of mass 25 kg rests on a horizon...

A block of mass `25 kg` rests on a horizontal floor `(mu = 0.2)`. It is attached by a `5 m` long horizontal rope to a peg fixed on floor. The block is pushed along the ground with an initial velocity of `10m//s` so that it moves in a circle around the peg. Find

(a) Tangential acceleration of the block.
(b) Speed of the block at time t.
(c) Time when tension in rope becomes zero.

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