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saat di meja h = 0,75 m , v = 0
saat di tanah h = 0
EM awal = EM akhir
Ep + Ek = Ep + Ek
mgh + 0 = 0 + Ek
Ek = mgh
Ek = 0,2 x 10 x 0,75
Ek = 1,5 Joule
h=75 cm =0,75 m
m=0, 2 kg
g=10 m/s²
dit: Ek=...?
Jawab:
Ek=1/2.m.V²
Ek=1/2.0,2.(2.g.h)
Ek=0,2(10.0,75)
Ek=1,5 J