The car, moving in a straight line on a horizontal road at a speed of 72 km / h, starts to brake. What distance will the

The car, moving in a straight line on a horizontal road at a speed of 72 km / h, starts to brake. What distance will the car travel by the moment when its speed decreases by 40%, if the coefficient of friction of the wheels on the road is equal to 0.4?

In the correct and accurate solution of this problem, we will be helped by the known to all physicists 2 Newton’s law.

This law is as follows:

M * gh = m * a.

In this formula, M is the coefficient of friction.

We get that a = M = 5 meters per second.

Now we plug that into the following formula:

S = v0 + v * t – (a / 2) * t * t, where v = 0 and v0 is the initial velocity.

Now we consider and get that S = 10 meters.

And we also understand that v0 = 72 kilometers per hour, which is = 20 meters per second.