Throttle formula

1. Turn off the throttle, and the car will lose power. The force analysis is shown in the above figure.

If the speed does not change after turning off the throttle, it means that the car is balanced.

So f=mg? Sina.com

2? Let the displacement of the car on the inclined plane be s when the speed increases to 5vo, and according to the kinetic energy theorem

Pt-fs+mgs？ Sina=m(5vo)*(5vo)/2-mvo*vo/2, and the value brought into f is obtained.

Pt=m(5vo)*(5vo)/2-mvo*vo/2

t=？ It can be concluded that

It should help you.