When is the coelom said to be a true coelom?

When is a collision said to be a perfectly inelastic? A mass is moving with speed v collides inelastically with another identical mass at rest. After collision, the first mass moves with velocity frac(nu)(sqrt 3) in a direction perpendicular to the initial direction of motion. Find the speed of the second mass after collision.

When is an element said to be deficient. in plant nutrition?

Why is the coelom in Ascaris described as pseudocoelom?

What is the term given to the wall of true fruit?

When two sources are said to be coherent?

Why does a convex mirror is said to have a virtual principal focus?