Number 4 I think
the atomic mass is 11 because the mass is the sum of protons and neutrons
Answer:

Explanation:
you mean deceleration right ? because the acceleration is 250m/s
in china, there is a family limit for only having 1 child
at 10 billion people on earth, we will most likely run out of food supply
It’s around the g force so it’s gonna be around 54 km/h