1. The problem statement, all variables and given/known data There are two cars travelling in a same direction. The Second car has a camera mounted on it and has ability to give relative X and Y (in meters) distance of first car with respect to it. Given the Speed of Second car , Calculate the Speed and Acceleration of first car. The First car gives relative x and y distances for every 0.01 seconds. 2. Relevant equations Differentiation of distance gives velocity and double differentiation of distance gives me acceleration 3. The attempt at a solution Vx = (x2-x1)/(t2-t1) ; t2-t1 is 0.01 seconds ; x2 is the X distance at second time instant and x1 is at first time instant Vy = (y2-y1)/(t2-t1) Speed = Sqrt(Vx^2 + Vy^2) Ax = (Vx2 – Vx1)/ (t2-t1) Ay = (Vy2 – Vy1)/ (t2-t1) I am not considering the Speed of Second vehicle at all... I think thats where I am getting wrong results. As camera gives me the relative x and y , and since camera itself is moving , Do I need to add the Speed to Vx and then compute acceleration >?