A car traveling 25 m/s begins to decelerate at a constant rate of 8 m/s^2

Question

After how many seconds does the car come to a stop?

How far will the car have traveled before stopping?

Answer 1

First we can write out what we have been given.

v₀ = 25 m/s

a = -8 m/s²

v_f = 0

Then helpful equations

v_f = v₀ + a*t

d = ((v_f + v₀)/2)*t

Use this first equation to solve for the time just by plugging in the other variables.

The second equation only works for constant acceleration.