Spiral galaxies are most common
Answer:
The age of the universe would be 9.9 billion years
Explanation:
We can calculate an estimate for the age of the Universe from Hubble's Law. Let's suppose the distance between two galaxies is D and the apparent velocity with which they are separating from each other is v. At some point, the galaxies were touching, and we can consider that time the moment of the Big Bang.
Thus, the time it has taken for the galaxies to reach their current separations is:

and from Hubble's Law:

Therefore:

With the given value for the Hubble's constant we have:

and thus,

Answer:
The acceleration of the elephant is 5m/s^2 (squared).
Explanation:
Given: Force=200N, Mass=1000kg
Required: acceleration=?
Equation: a=F/m
Solution: a=200N/1000kg
Answer: a=5m/s^2
Many ways for example they look up related things and study them or they can test it and see what happens