1. The problem statement, all variables and given/known data a fighter plane is moving in a horizontal circular path at a constant speed, it takes 9.8 seconds to change its heading by one quarter of a circle from north to east, if the radius of the curvature is 2.0 x 10^3, find d) the velocity change 3. The attempt at a solution v = d / t d = square root ((2.0 x 10^3)^2 + (2.0 x 10^3)^2) d ≈ 2828m d / t = 288.6m/s But the text book says the answer is 4.5 x 10^2 m/s I have no idea, in what other ways I can approach this. Help please. :( Pointing me in the right direction will do. ^_^ Thank you.