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  4. A body of mass 1kg is thrown upwards with a velocity 20ms- 1 . It momentarily comes to rest after attaining a height of 18m . How much energy is lost due to air friction? (g = 10 m s- 2) :-

Q. A body of mass is thrown upwards with a velocity . It momentarily comes to rest after attaining a height of . How much energy is lost due to air friction? :-

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