I need to find the velocity and acceleration

Question

https://imgur.com/a/khyioyF

Answer 1

s(t) = 6t³+5t+9

a) v(t) = ds/dt = 18t²+5 m/s

b) v(3) = 18(9) + 5 = 162+5 = 167 m/s

c) a(t) = dv/dt = 36t m/s²

d a(3) = 36(3) = 108 m/s²