1. The problem statement, all variables and given/known data The engine in an imaginary sports car can provide constant power to the wheels over a range of speeds from 0 to 70 miles per hour (mph). At full power, the car can accelerate from zero to 30.0 mph in time 1.30s . At full power, how long would it take for the car to accelerate from 0 to 60.0 mph ? Neglect friction and air resistance. 2. Relevant equations No clue 3. The attempt at a solution I assumed that since it takes 1.3s to go from 0-30, it would take 2.6 to got from 0-60, yet it was wrong and got this for a feedback. : Think about how kinetic energy is related to velocity, and how power is related to energy.