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A body of mass 2 kg is thrown up vertically with K.E. of 490 joules. If the acceleration due to gravity is 9.8 2 / s m , then the height at which the K.E. of the body becomes half its original value is given by

1. 50 m
2. 12.5 m
3. 25 m
4. 10 m

Correct answer: 12.5 m

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