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5 = 15 + 2a
-10 = 2a
a = -5
a (-) artinya perlambatan sebesar 5 m/s^2
V₀ = 15 m/s
Vt = 5 m/s
t = 2 s
Ditanya ⇒ a = ?
Penyelesaian ↓
a = (Vt - V₀) : t
a = (5 m/s - 15 m/s) : 2 s
a = -10 m/s : 2 ms
a = -5 m/s²
Jadi a adalah -5 m/s² (a = perlambatan).