1. The problem statement, all variables and given/known data A motor car of mass 2 tons moves from rest with constant acceleration and acquires a velocity of 30 miles/hr in 30 seconds . Show that the horse-power developed by the engine during that time is 16.43 . 2. Relevant equations Power = Work-done/Time taken 3. The attempt at a solution I just can't get the answer to match . I keep getting values much larger than 16.43 !