$A$ person continues to push a heavy mass for some time but fails to move it. What is the work done by him?

Which would have a greater effect on the kinetic energy of an object: doubling the mass,or doubling the velocity?

$A$ light and a heavy body have the same momentum. Which one will have greater kinetic energy?

How is the power related to the speed at which a body can be lifted? How many kilograms will a man working at the power of $100\, W$ be able to lift at a constant speed of $1\, m\, s^{-1}$ vertically (in $, kg$)? $(g = 10\, m\, s^{-2})$

$A$ light and a heavy body have equal kinetic energy. Which one is moving fast?

$(a)$ Give two conditions for work to be done.
$(b)$ What is the work done by frictional force on an object when dragged along a rough surface?
$(c)$ Relate power and work.
$(d)$ $A$ machine does $1960 \, J$ of work in $4 \, \text{minutes}$. What is the power?