1. The problem statement, all variables and given/known data It takes 185 kJ of work to accelerate a car from 23.0 m/s to 28.0 m/s. What is the car’s mass? 2. Relevant equations E=1/2mv^2 3. The attempt at a solution I get that I must put (2E) over V2 I am just not sure if I was allowed to put the change in velocity so it would look like this. (2E)/(V12 - V02) If it is correct will someone please tell me why?