Answer:
-2000 N
Explanation:
First of all, let's calculate the acceleration of the car:
[tex]a=\frac{v-u}{t}[/tex]
where
v = 0 is the final velocity of the car
u = 10 m/s is the initial velocity of the car
t = 5 s is the time elapsed
Substituting,
[tex]a=\frac{0-10 m/s}{5 s}=-2 m/s^2[/tex]
where the negative sign means it is a deceleration.
Now we can calculate the average braking force:
[tex]F=ma[/tex]
where m=1000 kg is the mass of the car. Substituting,
[tex]F=(1000 kg)(-2 m/s^2)=-2000 N[/tex]
and the negative sign means the force is opposite to the direction of motion of the car.
