Which of the illustrated graphs above represents a body moving with uniform retardation?

The correct relationship between the displacement, s, of a particle initially at rest in a linear motion and the time, t, is?

The joule is equivalent to?

Which of the following statement(s) is/are correct about a fixed mass of gas compressed in an inexpansible container;

I. The average speed of the molecules increases

II. The temperature of the gas increases

III. The molecules hit the walls of the container more often than before the compression 

An example of a mechanical wave is---------