1. The problem statement, all variables and given/known data A 1200 kg rocket car is placed at the bottom of a 100 meter long ramp inclined at 10°. The rocket is turned on and it exerts a force of 8300 N for 5.70 seconds, and then it shuts down. Find the speed with which the rocket car leaves the ramp (assume frictionless). 2. Relevant equations http://img98.imageshack.us/img98/9425/54fl1.png [Broken] 3. The attempt at a solution http://i.imgur.com/MGDp7Rf.png?1 I didn't show all of my solution but I need to know if that part is correct. What I did next is I assumed vi = 0 and the used the formula vf = vi + at which gave me an answer of 29.7 m/s, however, the correct answer is 28.8 m/s.