Complete the following sentences. a. The motion of the particles is a model of. . b. The movement of particles from one chamber to another is a model of. . c. When the average motion of the particles is the same in both chambers, this is a model of .

A12-g wad of sticky clay is hurled horizontally at a 100-g wooden block initially at rest on a horizontal surface. the clay sticks to the block. after impact, the block slides 7.5 m before coming to rest. if the coefficient of friction between the block and the surface is 0.65, what was the speed of the clay immediately before the impact?