Find the height at which a body weighing 5 kg has an energy of 145 J.

Task data: m (body weight) = 5 kg; En (potential energy possessed by a given body) = 145 J.

Reference values: g (acceleration due to gravity) ≈ 10 m / s2.

The height above the zero surface, on which the given body should be located, is expressed from the formula: En = m * g * h, whence h = En / (m * g).

Let’s make a calculation: h = 145 / (5 * 10) = 2.9 m.

Answer: The given body will have to be at a height of 2.9 m from the zero surface.