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v(t)= 4 + 4t + 3t^2
a(t)= 4+6t
a(3)=4+6(3)=22 m/s^2
V = dr/dt
= d(4t + 2t² + t³)/dt
V = 4 + 2.2t + 3t² = 4 + 4t + 3t²
kemudian turunkan lagi ke fungsi A untuk mencari percepatan :
A = dv/dt
= d(4 + 4t + 3t²)/dt
A = 4 + 6t
A(t) = 4 + 6(3)
A(3) = 4 + 18 = 22
A(3) = 22m/s²