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v1= 40 m/s
g= 10 m/s^2
h1=0 m
h2= 20 m
dit:
Ek2.....?
jawab:
Ek1+Ep1=Ek2+Ep2
1/2.m.v^2 + m.g.h = Ek2 + m.g.h
1/2.1.(40)^2 + 1.10.0 = Ek2 + 1.10.20
1/2.1600 + 0 = Ek2 + 200
800 + 0 = Ek2 + 200
800 = Ek2 + 200
Ek2 = 800-200
Ek2 = 600 joule