Hi, The question reads; A car motor produces 20Kw of power. All of which is transfered to the wheels producing drive, there is no resistance. the mass is 800kg. Calculate the acceleration after 7 seconds. I can see that it requires using dv/dt = a and rearanging Ke=1/2 mv^2 to include acceleration but when I tried using. v=u+at to form Ke= 0.5 M (AT)^2 I got an incorrect answer. HELP!