Tolong dong dibantu.

10.ep=75×10×100
=75000joule
dan em (energy mechanic) saat di ketinggian 100 m =75000 Joule

ep saat di 60 meter=75×10×60
=45000 joule
em1=em2
EP1+EK1=EP2+EK2
75000=45000+EK2
EK2=30000 joule
3×10^4=1/2×75×v^2
6×10^4=75×v^2
0,08×10^4=v^2
800=v^2
v=
[tex] \sqrt{800} [/tex]
m/s