Apolice car is stopped at a red light facing west. when the light turned green, a sports car speeds past it heading west at with
a constant velocity of 21 m/s. if the police car has a constant acceleration west at 3 m/s, how many seconds will it take to catch
up to the sports car? answer using only a numeric value, no units.

t = 14 seconds

Explanation:

As we know that the speed of the car which passes the police car is 21 m/s

so the distance moved by that car in next "t" seconds is given as

now we know that police car starts from rest at constant acceleration a = 3 m/s/s

so the distance moved by that car is given as

now if police catch the speeding car after "t" seconds so we have

the answer would be   dignified - apex

d) physical means can be used to separate the components of air.