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A small mass attached to a string rotate...

A small mass attached to a string rotates on a frictionless table top as shown. If the tension in the string is increased by pulling the string causing the radius of the circular motion to decrease by a factor of 2, the kinetic energy of the mass will

A

Decrease by a factor of 2

B

Remain constant

C

Increase by a factor of 2

D

Increase by a factor of 4

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