To determine the time it takes for the car to reach a velocity of 20 m/s from rest with a constant acceleration of 2.5 m/s², we can use the following equation:
v = u + at
where: v is the final velocity (20 m/s), u is the initial velocity (0 m/s, as the car starts from rest), a is the acceleration (2.5 m/s²), and t is the time we need to find.
Rearranging the equation, we have:
t = (v - u) / a
Substituting the given values, we get:
t = (20 m/s - 0 m/s) / 2.5 m/s² t = 20 m/s / 2.5 m/s² t = 8 seconds
Therefore, it will take 8 seconds for the car to reach a velocity of 20 m/s from rest with a constant acceleration of 2.5 m/s².