What power is required to accelerates a 1980kg car from 30km/h to 70km/h against a constant force of resistance of 750N over a distance of 85m.
Thank you for your help!
the average speed of the car is 50 kph
convert the speeds to m/s
find the time to cover the 85 m
find the change in kinetic energy
... KE = 1/2 m v^2
the work against resistance (friction)
... work = f d = 750 N * 85 m
work and energy are the same thing
add the work and the change in KE
... divide by the time
... this is the power (in Watts)