The body of what mass at a height of 10 cm has a potential energy of 0.3 J.

To find the mass of a body located at a height of 10 m, we will use the formula: Ep = m * g * h, whence we express: m = Ep / (g * h).

Variables: Ер – acquired potential energy (Ер = 0.3 J); g – acceleration due to gravity (g ≈ 10 m / s2); h – lifting height (h = 10 cm = 0.1 m).

Calculation: m = Ep / (g * h) = 0.3 / (10 * 0.1) = 0.3 kg.

Answer: At a height of 10 cm there is a body weighing 0.3 kg.