A racing car traveling with constant acceleration increases its speed from 10m/s to 50m/s over a distance of 60 m. How long does this take? A. 2.0 s B. 4.0 s C. 5.0 s D. 8.0 s E. The time cannot be calculated since the speed is not constant I did: x - xo = 0.5 (Vo + V)(t) Which is: 60 = 0.5 (60) (t) Which is: 60 = 30t t = 2 But, the answer is 4. What am I doing wrong?