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m=4 kg
g=10 m/s^2
Ek=..?
v=√2.g.h
v=√200
v=10√2 m/s
Ek=1/2.m.v^2
Ek=1/2.4.10√2^2
Ek=2.200
Ek=400 J
cara lain:
Ek=Ep
Ek=m.g.h
Ek=4.10.10
Ek=400 J