1. The problem statement, all variables and given/known data When a rocket reaches an altitude of 40m it begins to travel along the parabolic path (y-40)^2=160x, where the coordinates are measured in meters. If the component of velocity in the vertical direction is constant at vy=180m\s, determine the magnitudes of the rockets velocity and acceleration when it reaches an altitude of 80m. 2. Relevant equations position: r=x*i+y*j (where i and j are the unitvector) velocity: v=dr\dt acc: a=dv\dt 3. The attempt at a solution lets say i tried for about 4 hours to get a concept to solve this. :( first i put in in the equation for the motion path for y=80 to get x=10 second: position vector for point A (x=0,y=40) and point B (x=10 y=80) third: to get the distance betwee A and B i subtract the 2 position vectors. fourth: v=dr\dt to get the velocity mazbe its the wrong way because the answer should be v=201 m\s and mines was 254 m\s. i dont know where my mistake is...is the way of thinking right?