When an unbalanced force acts on an object,
a. the inertia of the object increases.
b. the object accelerates.
c. the weight of the object decreases.
d. the object���s motion does not change.?

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?