Hoisting crane in 20 sec. lifted a 500 kg load to a height of 10 m. How much has the potential

Hoisting crane in 20 sec. lifted a 500 kg load to a height of 10 m. How much has the potential energy of the load changed?

t = 20 s.
m = 500 kg.
h = 10 m.
ho = 0 m.
g = 9.8 m / s ^ 2.
ΔЕп -?
The potential energy of a body En with a mass of m, raised to a height of h, is determined by the formula: En = m * g * h.
The change in potential energy ΔEp is determined by the formula: ΔEp = En – Epo, where En is the potential energy at the end of the ascent, Epo is the potential energy at the beginning of the ascent.
Since ho = 0 m, then Eno = 0.
ΔЕп = m * g * h.
ΔEp = 500 kg * 9.8 m / s ^ 2 * 10 m = 49000 J.
Answer: the potential energy of the load has changed by ΔEp = 49000 J.