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A body of mass m is moving in a circle of radius r with a constant speed v . The force on the body is r mv 2 and is directed towards the centre. What is the work done by this force in moving the body over half the circumference of the circle

1. 2 2 r mv 
2. Zero
3. 2 2 r mv
4. 2 2 mv r 

Correct answer: Zero

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