Question

Question: A heavy and a light body have equal momentum. Which of the following has greater kinetic energy

... A body at ground level will have which energy?

Answer 1

The equation for kinetic energy is
K.E=½MV² -------1
The equation for momentum is
P=MV ----------2
multiplying the denominator and numerator of equation 1 with 'M'
K.E=(M²V²)/2M -------3
But MV=P
So,
K.E=P²/2M
If momentum is constant, then we can say that KE is inversely proportional to Mass. So, the one with lesser mass will have more kinetic energy.

A body at rest (at ground) possesses potential energy. Because there is gravitational force acting upon it. Without the application of gravity, a body can’t possess position of rest. There is no potential energy without gravitational force.