The big idea to remember is that mitosis is the simple duplication of a cell and all of its parts. It duplicates its DNA and the two new cells (daughter cells) have the same pieces and genetic code. Two identical copies come from one original. Start with one; get two that are the same. You get the idea.
So it is the very last stage!
P = mv
This is a momentum question:
Momentum is always conserved so the momentum before and after a collision must be equal so:
The velocity of the two objects after they collide and dont stick together if no KE is lost is dependent on the mass of each of the objects by:

Where i is initial and f is final meaning before and after the collision
Telomerase is found in fetal tissues, adult germ cells, and also tumor cells. Telomerase activity is regulated during development and has a very low, almost undetectable activity in somatic (body) cells. Because these somatic cells do not regularly use telomerase, they age.
I can’t see it vary well :(