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 machine rated as 150W, changes the velocity of a 10 kg mass from 4ms

1.	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
Answer» `70%` `30%` `50%` `40%` ANSWER :A