Two bodies A and B have same kinetic energies. Compare their velocities if mass of A is four times the mass of B.

Draw a graph of potential energy vs height from the ground for a body thrown vertically upwards.

(a) Name the waves used for echo depth sounding.

(b) Give one reason for their use in the above application

(a) Refer to the diagram given below. A lens with two different refractive indices is shown. If the rays are coming from a distant object, then how many images will be seen?

(b) A glass lens always forms a virtual, erect and diminished image of an object kept in front of it. Identify the lens.