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massa benda 2,5kg
ketinggian awal 15m
ketinggian saat posisi kedua 10m
gravitasi bumi 10m/s^2
Ditanyakan:
Ek saat h2=10m
Dijawab:
hukum kekekalan energi mekanik em1=em2
Em1=Ep1+Ek1
Em2=Ep2+Ek2
maka,
Em1=Em2
Ep1+Ek1=Ep2+Ek2
m.g.h+½m.v2=m.g.h+Ek2
2,5kg×10m/s2×10m+0 = 2,5kg×10m/s2×5m+Ek2
250 J = 125J+Ek
Ek=250 J -125 J
Ek=125 Joule.
Gomawo,Nee.
Smoga Membantu:)Dah