A hockey puck of mass m is attached to a string that passes through a hole in the center of a table, as shown in FIGURE 6-73. The hockey puck moves in a circle of radius r. Tied to the other end of the string, and hanging vertically beneath the table, is a mass M. Assuming the tabletop is perfectly smooth, what speed must the hockey puck have if the mass M is to remain at rest?

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m M