Of the same material. you place a at rest on an air track and give b a constant velocity directed to the right so that it collides elastically with a. after the collision, both carts move to the right, the velocity of b being smaller than what it was before the collision. what do you conclude?

Some of the kinetic energy from B has been transferred to A

Explanation:

In elastic collision, kinetic energy is conserved. Since A had 0 kinetic energy before the collision, while B has some kinetic energy. And kinetic energy is defined as

As the speed of B decreases post-collision, and its mass stays the same, kinetic energy of B must have been decreased as well.

A gains speed post collision, and so does its kinetic energy. So according to the law of energy conservation, some kinetic energy from B must have been transferred to A.

answer: (431,2)

step-by-step explanation:

air exerts forces on falling objects near earth’s surface.

explanation:

the term 'free falls' refer to object that are falling towards the earth, in a situation in which gravity is the only force acting on the object.

for an object in free fall, the acceleration is constant (g, the gravitational acceleration), and so the velocity of the object constantly increases.

for objects near earth's surface, there is always another force acting on the object: the resistance due to the air. this force is opposed to the direction of fall of the object, and it is proportional to the velocity of the object, so as the object falls down, this force increases up to a point when it balances the force of gravity, and the object continues its motion at constant velocity (called terminal velocity). since in this case gravity is not the only force acting on the object, we are not in a situation of free fall.