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m = 4 kg
vo = 0
a = 3m/s²
t = 2 s
ditanyakan :
W = ?
jawab :
vt = vo + at
vt = 0 + 3 (2)
vt = 6 m/s
W = ΔEk
W = 1/2 m (vt²-vo²)
W = 1/2 (4) (6²-0)
W = 2 (36)
W = 72 Joule