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A machine rated as 150W, changes the vel...

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

A

`70%`

B

`30%`

C

`50%`

D

`40%`

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The correct Answer is:
A
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