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

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

The velocity of a 10 kg mass is increased from 2m *s^(-1) to 4m*s^(-1) . The amount of work done in doing so is

Calculate the change in energy for a body of mass 5 kg, change its velocity from 10 m/s to 16 m/s.

A machine is depreciated at the rate of 10 % yearly and the ultimate scrap value was ₹ 6561. Find the effective life of the machine. The price of the machine is ₹ 10,000.

A boy of mass 50kg is standing on a weihing machine placed on the floor of a lift. The machine reads his weight in newtons. The reading of the machine if the lift is moving upwards with uniform speed of 10ms^(-1) .