Car b is following car a and has a greater speed than car a. the two cars are moving in a straight line and in the same direction, and have the same mass. in situation one, car a is traveling at 10 mph and car b at 20 mph. in situation 2, car a is traveling at 30 mph and car b at 40 mph. assuming a perfectly inelastic collision in which the cars stick together after the collision, what will be true?

Collision force will be same in both the cases.

Explanation:

A perfectly inelastic collision is said to take place  when a system loses the amount of its Kinetic Energy at its maximum. In a perfectly inelastic collision,  the colliding particles stick to each other. In such a collision, kinetic energy is lost by combining the two bodies with each other.

In situation 1:

Speed of Car A,

Speed of Car B,

Relative speed of car A and car B,

Now, in the situation 2:

Speed of car A,

Speed of car B,

Relative speed of car A and car B,

Therefore, Car A and Car B both have the same relative speed, v = 10 m/s

positive reinforcement? ?

real, smaller and upside-down.   so the answer should be b.