A jet plane is cruising at 300 m/s when suddenly the pilot turns the engines up to full throttle. After traveling 4.0 km, the jet is moving with a speed of 400 m/s. assuming a constant acceleration, what is it. answer is in m/s^2 I am not seeing how this is done without using time. also as a general question. i have no problem with math because it is logical and you have equations to solve it. but physics, i am constantly lost. am i to use known equations or do i have to make things up?