Question

Define escape velocity. Obtain an expression for the escape speed of an object from the surface of the earth​

Answer 1

Explanation:

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 m on the surface of earth

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

and earth is F=

R

2

GMm

gravity potential energy

(GPE)=

R

2

GMm

w=F.S=

R

2

GMm

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.