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Answer :
Final answer:
The work done on the ball by gravity is -118 J and the work done on it by the tension in the string is zero.
Explanation:
The work done on the ball by gravity and the tension in the string can be determined using the work-energy theorem. As the ball swings from its lowest point to its highest point, the work done on it by gravity is -118 J, and the work done on it by the tension in the string is zero.
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Answer:
The ball moves from lowest to highest point:
W = M g h = 3 * 9.8 * 4 = 118 J
This is work done "against" gravity so work done by gravity is -118 J
The tension of the string does no work because the tension does not
move thru any distance W = T * x = 0 because the length of the string is fixed.
