What is velocity head.What it implicates?

What is escape velocity? What is it’s value for a body to escape the earth.?

What is terminal velocity?

What is critical velocity? What factors it depend?

What is relative velocity,Elucidate with examples.

What is the velocity of the projectile highest point ?

There are three coins, one is a two headed coin (having head on both faces), another is a biased coin that comes up heads 75% of the time and third is an unbiased coin. One of the three coins is chosen at random and tossed, it shows head. What is the probability that it was the two headed coin?

What is the velocity with which the heat radiations propagate ?