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Calculations:

Blue Car:

Vi= 10 m/s

Vf = 10 m/s

deltaT = 12 s

deltaD = 120 m

acceleration = 0

Police Car:

Vi = 0m/s

acceleration = 4m/s^2 (for the first 3 seconds)

deltaD (for first three seconds) = 18 m

Vf = 12 m/s

So when the deltaD of the blue car = the deltaD of the police car, the police car is at the same distance as the blue car.

How would I go about doing this?