Question

In coming to a stop, a car leaves skid marks 85m long on the highway. Assuming a deceleration of 3.0m/s/s , estimate the speed of the car just before braking.

Answer 1

thats \[3m/s ^{2}\]

Answer 2

Use the formula:
\[v^2 - u^2 = 2as\]v = final velocity, that is 0ms^2 (since the car stops)
u= initial velocity (the speed before that car starts decelerating)
a = deceleration
s = stopping distance

Answer 3

Right on callisto, i appreciate your help.