When a body falls freely towards the earth,then its total energy

Calculate the kinetic energy of a body of mass $2 \, kg$ moving with a velocity of $0.1 \, m s^{-1}$. (in $, J$)

State the relation between $kWh$ and joule. Define $1$ watt.

Can any object have momentum even if its mechanical energy is zero? Explain.

$(i)$ Define the term potential energy. Write the $SI$ unit of potential energy.
$(ii)$ $A$ body of mass $50 \, kg$ is situated at a height of $10 \, m$. What is its potential energy? (Given $g = 10 \, m s^{-2}$)

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