Acar is skidding to a stop on a level stretch of road. you may want to review ( pages 115 - 117) . part a identify the number of the action/reaction pairs of forces between the car and the road surface.

The number of the reaction / action pairs of forces between the car and the road surface is 2 pairs. The car and the road surface can have a total number of 2 reaction or action pairs. So the answer is basically 2 pairs.

B) as the temperature increases, the kinetic energy of the particles increases.|-/

W= fd
where f is an applied force and d is the distance over which it is applied. when a parachuting skydiver is at constant velocity, he is experiencing "terminal velocity", the point at which his acceleration down is canceled out by air resistance. that means that the resisting force of the air is equal to his weight, but in the opposite direction. with this, we can solve for the work done by the force.
w = fd
w = (92.0)(9.81 m/s^2) (325)
w= 2.93 x 10^5 j
the value for work in this case is positive because it is pushing up on the skydiver, who has a downward force of gravity.
therefore the answer is 2.93 x 10^5 j