Ive come accross this question, and just pondering on is i am right or completely wrong?! The question is: A jumbo jet must reach a velocity of 360km/h for takeoff. It uses a 1.8km runway. What is the constant acceleration required for it to reach the velocity before takeoff? I tried a few different times but sometimes I get different answers. So, I have the required velocity, the distance and so far the acceleration is x. So, first I calculated the time from 0 to 360km/h down a 1.8km runway. 360=1.8/t =360t=0.005 hours = 18 seconds to move down the runway. And now i do Velocity- acceleration x time 360=A18 360/18=A A=20km/hour or 5.56m/s Is this completely wrong:(?