A 3.00 kg ball swings rapidly in a complete vertical circle ofradius 2.00 m by a

Question

A 3.00 kg ball swings rapidly in a complete vertical circle ofradius 2.00 m by a light string. the ball moves so fast thatthe string is always taut. as the ball swings from its lowestpoint to its highest point:
A) the work done on it by gravity is -118 J and the work doneon it by the tension in the string is zero.
B) the work done on it by gravity is +118 J and thework done on it by the tension in the string is -118 J.
C) the work done on it by gravity is and the work done on itby the tension in the string are both equal to zero.
D) the work done on it by gravity is -118 J and the work doneon it by the tension in the string is +118 J.
E) the work done on it by gravity and the work done on it bythe tension in the string is are both equal to -118J.
A) the work done on it by gravity is -118 J and the work doneon it by the tension in the string is zero.
B) the work done on it by gravity is +118 J and thework done on it by the tension in the string is -118 J.
C) the work done on it by gravity is and the work done on itby the tension in the string are both equal to zero.
D) the work done on it by gravity is -118 J and the work doneon it by the tension in the string is +118 J.
E) the work done on it by gravity and the work done on it bythe tension in the string is are both equal to -118J.

Explanation / Answer

No work is done by the tension in the string because W = F xand the tension does no work along its (changing) direction. The work done "against" gravity is mgh = 118 J Only (A) is correct

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