Answer:
a
The final temperature is 
b
The initial and the final temperature are the same
Explanation:
The explanation is shown in the first and second uploaded image
The difference between them is that
velocity is the speed with a direction, whereas speed does not have a direction.
<h3>b. ML </h3><h3>c. M</h3><h3>d. Kg</h3>
<h3>Hope it helps...</h3>
Sodium (Na) is very reactive because it does not have a full valence shell.
Since they are both examples of moving waves, they both transmit energy.