A car weighs 5 * 10 quartic power n, runs at a speed of 36km / h on a straight road for 1min at a constant speed, and the resistance is 0.06 times of the car weight Seeking the power of automobile engine

A car weighs 5 * 10 quartic power n, runs at a speed of 36km / h on a straight road for 1min at a constant speed, and the resistance is 0.06 times of the car weight Seeking the power of automobile engine


The uniform velocity is f = f, f = 0.06 mg s = vt



What is the average speed of a car driving on a straight road, first driving at a speed of 10m / s for 100m, then driving at a speed of 20m / s for 300m?


The average speed of the whole journey is v = st1 + T2 = 400m10s + 15s = 16m / s