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mason is supplied with bricks by his assistant who is 3 m below him the...

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mason is supplied with bricks by his assistant who is 3 m below him the assistant tossing the brick vertically up The speed of the brick when it reaches the mason is 2 m s What percentage of energy used up by the servant serves no useful purpose a 9 8 b 4 9 d 10 c 5 6

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