What force should be applied on a body of mass 500 kg to change its velocity from 4 `ms^(1)` to 6 `ms^(-1)` in one second ?

A force is applied on a body of mass 20 kg moving with a velocity of 40ms^(-1) . The body attains a velocity of 50ms^(-1) in 2 second. Calculate the work done by the body.

A constant force acting on a body of mass of 5 kg change its speed from 5ms^(-1) "to" 10ms^(-1) in 10 s without changing the direction of motion. The force acting on the body is

A constant force acting on a body of mass of 5 kg change its speed from 5ms^(-1) "to" 10ms^(-1) in 10 s without changing the direction of motion. The force acting on the body is