1. ## a derivative proble,

Hi!everyone:
Here is the question:

A car accelerates from rest to a maximum velocity at t=45 secs and then decelerates to a stop in t=120 secs. Distance traveled in meters is given by
s(t)=3t^2-(1/60)t^3, finds'(t) and s''(t)

2. Originally Posted by dragonballv
Hi!everyone:
$\frac d{dt}t^n = nt^{n - 1}$