Please could I get some help with the following question:
A 1300kg car travels at a steady speed, covering 75m in 5.0 seconds. Frictional forces are constant and are 450N in total. Work out the power output of the engine, assuming 100% efficiency.
Here is my attempt:
Ke = 1/2mv^2 1/2*1300*(75/5)^2 = 146250J
w=fd 450*75 = 33750J
146250 + 33250 = 180,000J
p = e/t 180,000/5 = 36000W