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=1/2.40.20 pankat 2
=1/2.40.400
=16000/2
=8000 joule
h = 20 m
Ek saat 10 m =?
E awal = E akhir
Ep1 + Ek 1 = Ep 2 + Ek2
mgh1 + 0 = mgh2 + Ek2
40x 10 x 20 = 40 x 10 x 10 + Ek
8000 = 4000 + Ek
Ek = 8000-4000
Ek = 4000J