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r = dx/dt
= 12t² + 4t + 0
a = dr/dt
= 24t + 4t
saat t = 0, a = 24.0 + 4 = 4 m/s²
saat t = 2, a = 24.2 + 4 = 48 + 4 = 52 m/s²
a = Δv/Δt
a = (v2 - v1) / (t2 - t1)
a = (52-4)/(2-0)
a = 48/2
a = 24m/s²