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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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By Expert Faculty of Sri Chaitanya
a
70%
b
30%
c
50%
d
40%

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detailed solution

Correct option is A

P=12mv2u2t=12×10×(10016)4

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


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