1. The problem statement, all variables and given/known data A 2.34-kg cart on a long, level, low-friction track is heading for a small electric fan at 0.22 m/s . The fan, which was initially off, is turned on. As the fan speeds up, the magnitude of the force it exerts on the cart is given by at2, where a = 0.0200 N/s2. What is the speed of the cart 3.5 s after the fan is turned on? 2. Relevant equations F=ma 3. The attempt at a solution a=F/m =0.02t^2/2.34 *t^2 =0.0085t^2 v=0.205(3.5)^3+ 0.22 =9.00m/s what is my error?