A puck attached to a string moves in a circular path on a frictionless surface, as shown in Figure 11–34. Initially, the speed of the puck is v and the radius of the circle is r. If the string passes through ahole in the surface, and is pulled downward until the radius of the eircularpath is r /2, (a) does the speed of the puck increase, decrease, or stay the same? (b) Calculate the final speed of the puck.
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