When a substance absorbs or releases heat, the changes. 1.Internal Energy
2.Potential Energy
3.Kinetic Energy
4.Spring Potential Energy

If the chemical properties of a substance remain unchanged and appearance or shape of a substance changes it is called a ?

First to answer will be the brainliest i need the answer asap

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?