1. is the distance between one point of a wave to the same point in the next wave. 2. is the number of waves per unit of time. indicate the distance that represents the amplitude. crest trough the number of complete waves that pass a given point in a certain amount of time the maximum distance the particles of the medium carrying the wave move away from their rest positions 3 longitudinal transverse waves move at a angle longitudinal because it Waves move the particles of the medium parallel to the direction in which the waves are traveling 3. waves occur when the motion of the medium is parallel to the direction of the wave. 4. The is the top of a wave. 5. The is the bottom of a wave. 6. is the maximum distance that matter is displaced from the resting position. 7. waves occur when the motion of the medium is at right angles (perpendicular) to the direction of the wave.

12000j is work done

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.