A hockey puck of mass m = 70 g is attached to a string that passes through a hole in the center of a table, as shown in the figure below. The hockey puck moves in a circle of radius r = 1.20 m. Tied to the other end of the string, and hanging vertically beneath the table, is a mass M = 1.40 kg. Assuming the tabletop is perfectly smooth, what speed must the hockey puck have if the mass M is to remain at rest?
My physics optional extra work: This would be helpful so I can compare the solutions here as I do the work by myself.
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Wouldn't it be better if you showed your work and let us check it for accuracy. That way we're checking you instead of you checking us.
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