Question

How mass of the body increases with its speed ?explain with proof.

Answer 1

MASS of the body not increase with speed but with velocity for more information read thoroughly The theory of special relativity. It says time slows down as velocity increases and sme with mass it increases with velocity.
Reltivistic mass= rest mass/root(1-velocity of object square/speed of light square) try thos equation assume the velocity of object according to you but the velocity should be in fractions to that ofo light.