Well since we're doing the Lewis dot diagram do you know which element on the table that it is?
Answer:
I think D am not pretty show
Explanation:
According to the law of conservation of energy, work done by the force is as follows.
= 64.95 J
Now, gain in potential energy is as follows.
P.E = mgh
= 
= 29.4 J
Gain in potential energy will be as follows.
= 
= ![\frac{1}{2} \times 30 N/m \times [(2.5 - 1.5)^{2} - (2 - 1.5)^{2}]](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7B2%7D%20%5Ctimes%2030%20N%2Fm%20%5Ctimes%20%5B%282.5%20-%201.5%29%5E%7B2%7D%20-%20%282%20-%201.5%29%5E%7B2%7D%5D)
= 11.25
As,

= 64.95 J - 29.4 - 11.25
= 24.3

v = 4.92 m/s
Therefore, we can conclude that relative velocity at point B is 4.92 m/s.
Cleaning your area and wearing safety gear