The average braking force of a 1000-kg car moving at 10 m/s braking to a stop in 5 s is

-2000 N

Explanation:

First of all, let's calculate the acceleration of the car:

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,

where the negative sign means it is a deceleration.

Now we can calculate the average braking force:

where m=1000 kg is the mass of the car. Substituting,

and the negative sign means the force is opposite to the direction of motion of the car.

truck y has a greater velocity than truck x.

molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.