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m = 5 kg
Vo = 0
t = 5 s
F = 5 N
sin θ = 3/5 --> cos θ = 4/5
Percepatan
F = m a
5 = 5 a
a = 1 m/s²
Perpindahan
S = Vo t + ½ a t²
S = 0 + ½ (1) (5)²
S = 12,5 m
Usaha
W = F S cos θ
W = (5) (12,5) (4/5)
W = 50 J ← jawaban
STJ
W = ½ F² t² / m
Ok ?