The final velocity is half of train car B's initial velocity.
a substance's density is the same at a certain pressure and temperature, and the density of one substance is usually different than another substance.
Answer:
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Answer:

Explanation:
We are given that
Mass of proton=
Initial speed of proton=



Where x is the separation between the two objects.
We have to find the speed of the proton when it is
from the uranium nucleus.
It means we have to find 
By work energy theorem
W=
Substitute the values


![W=\alpha[x^{-1}]^{-8\times 10^{-10}}_{-5}](https://tex.z-dn.net/?f=W%3D%5Calpha%5Bx%5E%7B-1%7D%5D%5E%7B-8%5Ctimes%2010%5E%7B-10%7D%7D_%7B-5%7D)









Hence, the speed of proton when it is
from the uranium nucleus=