Astone is dropped from rest at the top of a mine shaft. it takes 15 s for a stone to fall to the bottom of a mine shaft. how deep is the shaft?

Daughter element the new element produced along with a decay particle in a nuclear transmutation 2. half-life the substance that decays in a nuclear transmutation 3. parent element the change of one chemical element into another by nuclear decay or radioactive bombardment 4. transmutation the time required for the decay of one-half of the atoms in a sample of radioactive material