1. The problem statement, all variables and given/known data Initial velocity = 17 m/s Radius of curvature = 13 m Acceleration as a function of position = -0.25s m/s^2 Time elapsed = 2 s Solve for the magnitude of the acceleration. 2. Relevant equations a = v (dv/ds) a^2 = a(t)^2 + a(n)^2, wherein a(t) is tangential acceleration and a(n) is normalized acceleration. 3. The attempt at a solution a*ds = v*dv int(-0.25s*ds) = int(v*dv) v^2 = -0.25s^2 From this point I have hit significant difficulty, as you cannot take the square root of a negative number. Presumably there is another method to solve this equation that I have neglected, but it hasn't occurred to me, and my professor is notoriously poor at returning emails. Any thoughts?