A body raised above the ground to a height of 2m has a potential energy of 40 J. What is the mass of this body?

The potential energy of a body (in the gravitational field of the Earth) can be calculated by the formula:

Ep = m * g * h, where Ep is the potential energy of the body (Ep = 40 J), m is the sought body mass (kg), g is the acceleration of gravity (we take g = 10 m / s²), h is the height of the body relative to land (h = 2 m).

Let us express and calculate the body mass:

m = Ep / (h * g) = 40 / (10 * 2) = 40/20 = 2 kg.

Answer: Body weight is 2 kg.