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

answer and explanation;

the answer is the first electromagnet (a). this is because it has more coils around the ferromagnetic material. increasing the number of coils increases the surface area in which the metal interacts with the current in the coil. this enables more atoms in the metal to become aligned hence becoming more magnetized.