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Vo=36 km/jam=10 m/s
Vt=72 km/jam=20 m/s
W=..?
W=ΔEk
W=1/2.m.(Vt^2-Vo^2)
W=1/2.1500(20^2-10^2
W=1/2.1500(400-100)
W=1/2.1500.300
W=1/2.450.000
W=225.000J