A 1500 kg car decelerates from an initial velocity of 19 m/s to a skidding stop. If the coefficient of kinetic friction is 0.100, how long are the skid marks?

19.4 seconds

Explanation:

We have:

m: mass of the car = 1500 kg

v₀: is the initial speed = 19 m/s    

: is the final speed = 0 (it stops)

: is the coefficient of kinetic friction = 0.100

First, we need to find the acceleration by using the second Newton's law:

Solving for a:

Now we can find the time until it stops:

Solving for t:

Therefore, the time until it stops is 19.4 seconds.

I hope it helps you!                                            

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