Identify the kind of energy possessed by a running athlete.

$A$ light and a heavy object have the same momentum. Find out the ratio of their kinetic energies. Which one has a larger kinetic energy?

$(a)$ What is meant by mechanical energy? State its two forms. State the law of conservation of energy. Give an example in which we observe a continuous change of one form of energy into another and vice-versa.
$(b)$ Calculate the amount of work required to stop a car of $1000 \, kg$ moving with a speed of $72 \, km \, h^{-1}$.

When an arrow is shot from its bow,it has kinetic energy. From where does it get the kinetic energy?

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

State whether the following statement is true or false:
If we know the speed and mass of an object,we can find out its kinetic energy.