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Q.

A body of mass $2 kg$ is moving in a vertical circle of radius $2 m$ . The work done against gravitational force when it moves from the lowest point to the highest point is

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a

zero

b

$20 J$

c

$80 J$

d

$40 J$

answer is A.

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Detailed Solution

work done = change in potential energy $= 2 m g r$ $= 2 \times 2 \times 10 \times 2$ $= 80 J$

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