Question

obtain an expression for the escape velocity of a body from the surface of the earth​

Answer 1

Answer:

Escape velocity: -The minimum speed with which a body must be projected 

in order that it will escape from the earth gravitational filed is called as 

escape velocity.

Expression of it:-consider a body of mass mon the surface of earth

whose mass and radius are respectively represented by M and R.

and earth is F=R2GMm

gravity potential energy 

(GPE)=R2GMm

w=F.S=R2GMm

In order to projector body into the space overcoming the earth's 

gravitational field it must be give a kinetic energy which is equal to

potential energy.

therefore;

kinetic energy is equal to potential energy.