Gary rides his bike down the street in 30 s. his speed was a constant 5 m/s. what is the value of his acceleration during this time?

Why are some galaxies’ spectra blueshifted rather than redshifted? question 4 options:

Avery hard rubber ball (m = 0.5 kg) is falling vertically at 4 m/s just before it bounces on the floor. the ball rebounds back at essentially the same speed. if the collision with the floor lasts 0.05 s, what is the average force exerted by the floor on the ball?

What is the earliest point in the universe that we can observe? why can’t we see back further than this?