Paul swims 7.5 kilometers in 1.5 hours. What was his average speed?

The discovery that the universe appears to be expanding led to a widely accepted theory called a.) the big bang theory b.) the doppler effect c.) hubble’s law d.) solar nebular theory e.) the seyfert theory

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body

The softest and hardest minerals are: softest hardest