Question

A body of mass m is situated at a distance 4r above the earth surface where r is radius of earth how much minimum energy should be given to the body so that it may escape

Answer 1

The minimum energy that should be given to the body so that it may escape will be mgr/5

Explanation :

Given the distance of body from the earth's surface = 4r

Radius of earth = r

mass of the body = m

we know that the potential energy of the body is given by,

PE = -(mgr)/(1 + 4r/r)

=> PE = -mgr/5

Now in order to escape the bodies net energy should be zero.

Hence the minimum energy that should be given to the body so that it may escape will be mgr/5

Answer 2

Answer:

Minimum energy required escape the body will be mgr/5....

Explanation:

Given:

• mass of the body is m.
• Radius of the earth is r.

we know that,

=>PE = -mgr/1+n/r

=>-mgr / 1+4

=>-mgr /5

As h = 4r

•°• so, minimum energy required escape the body will be mgr/5