2)Law of conservation of energy is the in which energy can not be created or destroyed, energy  can only be transferred  and stored in or through objects.

3) Ei = Ef

KEbefore + PEbefore = KEafter + PEafter

GPEI + SPEI + KEI = GPEI + SPEI + KEI

4) SI units is calories, BTUs,

5)  https://youtu.be/LrRdKmjhOgw

6) Raul with 30 kg of mass jumps off a 10 meter building into a huge net. What is his final velocity?

7)