Answer:
i think the answer is B but im not sure
It is called a photon i believe
Tin is Sn, atomic number 47 is Silver, Mass of sodium is 22.9 u
Look at the third one i think its the answer
When the child is moving, he/she has kinetic energy. For just a brief second before they move the other way, the child is not moving, but they have gravitational potential energy.
The child may need a push from time to time because friction with the air causes loss of energy.
