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Q.

A machine rated as 150W, changes the velocity of a 10kg mass from 4ms–1 to 10ms–1 in 4s. The efficiency of the machine nearly is

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a

40%

b

30%

c

70%

d

50%

answer is A.

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Detailed Solution

P=12mv2−u2t=12×10×(100−16)4

P=5 × 844=105 W
efficiency: η=105150×100=70%

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