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

$A$ body moves along a circular path. How much work is done in doing so? Explain.

$A$ force of $10\, N$ moves a body with a constant speed of $2\, m s^{-1}$. Calculate the power of the body.

$A$ man rowing a boat upstream is at rest with respect to the shore. Is he doing work?

$(a)$ State the law of conservation of energy.
$(b)$ Establish the relation between the $SI$ unit of energy and the commercial unit of energy.
$(c)$ $A$ toy car is displaced through $5 \, m$ on the application of a force of $7 \, N$. Assuming the force acts on the object throughout the displacement,what is the work done in this case?

State whether the following statement is true or false:
When an arrow is released from a bow,potential energy changes into kinetic energy.