A metal rod is 25.000 cm long at 25.0 degrees Celsius. When heated to 102.0 it degrees Celsius, it is 25.054 cm long. What is the coefficient of linear expansion for this metal.

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?