How much does the boy’s Ep increase if he climbed from the 2nd to the 5th floor with a floor height of 3m.

To find out the increase in the potential energy of the specified boy, consider the formula: ΔEp = mm * g * Δh = mm * g * he * ne, where g is the acceleration of gravity (g ≈ 10 m / s2); he – the height of each floor (he = 3 m); nэ – the number of floors passed by the boy (nэ = 3 floors).
Let’s perform the calculation: ΔEp = mm * g * he * ne = mm * 10 * 3 * 3 = 90mm.
Answer: The potential energy of the said boy has increased by 90 mm J.