va roggg ajutor!!!!
![Va Roggg Ajutor class=](https://ro-static.z-dn.net/files/db0/02fb6e2b7c504017aaea2f8290617957.jpg)
Ep=mgh
Ep=52 kg*10 m/s²*40 m
N/kg=m/s²=>kg=Ns²/m
Ep=52 Ns²/m*10 m/s²*40 m
Ep=52*10*40 N*m
Ep=20800 J
Ep=20,8 KJ