Minta tolong no 1. Ya guys

Posisi:
r = 4t²i – (6t² + 2t)j – (4t³ – 1)k

kecepatan:
v = dr/dt (turunan)
v = 8ti – (12t + 2)j – 12t²k

percepatan:
a = dv/dt (turunan)
a = 8i – 12j – 24tk
t = 1 sekon
a (1) = 0i – 0j – 24(1)k
a = 24