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.

a high pressure system is a dense air mass that is usually cooler and drier than the surrounding air. a low pressure system is a less dense air mass that is usually wetter and warmer than the surrounding air.

in general, areas that experience high atmospheric pressure also experience fair weather. low pressure systems can cause the formation of clouds and storms. air usually flows from areas of high pressure to areas of low pressure..

not too sure thinking all accelerations are pointed down