PLEASE HELP DUE TONIGHT 2 QUESTION A rock thrown straight up with a velocity of
21 m/s from the edge of a building just misses
the building as it comes down. The rock is
moving at 46 m/s when it strikes the ground.
How tall was the building? The acceleration of gravity is 9.8 m/s^2.
Answer in units of m.

It is believed that the universe began with
a big bang about 18 billion years ago. Neglecting the expansion of the universe, we can
reason that the most distant objects observable are no further than the distance light
could have traveled in 1.8 × 10^10 years.
If the speed of light is 2.99792 × 10^8 m/s,
what is the maximum possible radius of the
observable universe?
Answer in units of m.