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Persamaan posisi :
X(t) = 4t + 2t² + t³
V(t) = dx/dt 4t + 2t² + t³
= 8 + 4t + 3t²
a(t) = dv/dt 8 + 4t + 3t²
= 4 + 6t
jadi percepatan saat t = 3 s yaitu :
a (t) = 8 + 4 + 6t
= 4 + 6(3)
= 4 + 18
= 22 m/s²