What is the average power needed to accelerate a 630 kg car from 0 to 65 mi/h in 6.0 seconds? Assume that all forms of frictional losses can be ignored. i've calculated change in kinetic energy to be 20475 J using: 1/2mv(final) - 1/2mv(initial). Since, change in kinetic energy is equal to work, i applied it to P = W/t. The answer I am getting is wrong and i've also tried converting mi/h to m/s and the answer is still not right, what am i doing wrong??