Answer:
As the ball gains height it's potential energy will increase and it's kinetic energy will decrease. As the ball falls back down to the ground the kinetic energy will increase and it's potential energy will decrease.
I believe it is 11. Because there are no electrons you do not need to subtract anything.
Extension of the elbow? im not sure
Answer:
Missing 0.4 what you need is 8.4
Explanation: