A car slows from 27 m/s to 5 m/s with a constant acceleration for 6.87 s. What is the car's acceleration?

In this case, the movement is uniformly delayed (the final rapidity is less than the initial rapidity), therefore, the value of the acceleration will be negative.

1. The following equation is used:

a = (Vf-Vo) / t

a: acceleration (m/s2)

Vf: final rapidity (m/s)

Vo: initial rapidity (m/s)

t: time (s)

2. Substituting the values in the equation:

a = (5 m/s - 27 m/s) / 6.87 s

3. The car's acceleration is:

a = - 3.20 m / s ^2