posted by Anonymous .
A driver in a 2000 kg Porsche wishes to pass a slow moving school bus on a 4 lane road. What is the average power in watts required to accelerate the sports car from 30 m/s to 60 m/s in 9 seconds?
Divide the K.E. change (in Joules) by 9 seconds.
(M/2)(V2^2 - V1^2)/9 = 300,000 W
That is about 400 Horespower