A hockey puck of mass 0.300 kg is attached to a string that passesthrough a hole

Question

A hockey puck of mass 0.300 kg is attached to a string that passesthrough a hole in the center of
the table. The hockey puck moves in a circle of radius 0.750 m.Tied to the other end of the string,
and hanging vertically beneath the table, is a block of mass 2.00kg. Provided that the table is
frictionless, what must the magnitude of the velocity of the puckbe in order for the hanging mass
to remain stationary?

I've set up a free body diagram, but am having trouble solving.Will rate lifesaver. Thanks!

Explanation / Answer

The centripetal force acting on the hockey puck is balancedwith weight of the block. So   mv2 / r = Mg       (0.300kg)(v2) /(0.750m) = (2.00kg)(9.8m/s2)                  v = 7.0 m/s

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