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W = ΔEk
hitung dulu percepatannya :
F = m.a
75 = 5.a
a = 15 m/s^2
hitung kecepatannya setelah 4 s:
Vt = Vo + a.t
Vt = 0 + 15.(4)
Vt = 60 m/s
W = ΔEk = (0,5).(5).(60)^2 = 9000 joule.