1- A 6500 kg truck traveling at + 7 m /s collides head with a 2500 kg car have traveling with a velocity of - 3 m/s . the truck and the car entangle and move together after the collision as shown in figure below . Find : BEFORE AFTER a ) What is the velocity of the truck and the car immediately after the collision . b ) Fill the table below before and after the collision .

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