Answer:
is the mass of librarian.
Explanation:
Given:
- mass of the system,

- velocity of librarian relative to the ground,

- velocity of the cart relative to the ground,

N<u>ow using the principle of elastic collision:</u>
Net momentum of the system is zero.


is the mass of librarian.
Answer:
I can't see it good on my phone sorry can't help you
The answer id D Has a very fast-growing economy.
Have a nice day
Answer:
I am kind of confused-
Explanation:
Do you mind re-writing and explaining the question more?
It's by number of protons