Answer:
16 N
Explanation:
Initial speed of a car, u = 12 m/s
Finally, it stops, v = 0
The car covers a distance of 9 meters.
The mass of a car is 9 kg
We need to find the friction force. Friction force always acts in the opposite direction to the direction of motion. It is given by :
F = ma
a is the acceleration of the car. We can find it using third equation of motion as follows :
[tex]v^2-u^2=2as\\\\a=\dfrac{-u^2}{2s}\\\\a=\dfrac{-(12)^2}{2\times 9}\\\\a=-8\ m/s^2[/tex]
Net force is given by :
F = ma
[tex]F=2\times (-8)\\\\=-16\ N[/tex]
So, the force of friction has a magnitude of 16 N.
