The displacement of a particle t is given by a=40t3-t2-3t+3 find the. (a) velocity of the particle when t=2

Question

The displacement of a particle t is given by a=40t³-t²-3t+3 find:

1.  velocity of the particle when t=2

Answer 1

Differentiate a to get
         V=120t²-2t-3
Then when t=2
         V=120(2)²-2(2)-3
            = 480-4-3
            = 473m/s