s = 4t3 + 7t2 − 2t

`v=(ds)/(dt)=12t^2+14t-2`

`a=(d^2s)/(dt^2)=24t+14`

At `t= 10`, the acceleration will be

`a=24(10) + 14 = 254` ms-2.

Easy to understand math videos:
MathTutorDVD.com