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

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detailed solution

Correct option is A

$P = \frac{\frac{1}{2} m (v^{2} - u^{2})}{t} = \frac{\frac{1}{2} \times 10 \times (100 - 16)}{4}$

$P = \frac{5 \times 84}{4} = 105 W$
efficiency: $η = \frac{105}{150} \times 100 = 70 %$

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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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Ready to Test Your Skills?

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