An object is kept at rest at a distance of 3 R above the earth's surface where R is earth's radius. The minimum speed with which it must be projected so that it does not return to earth is :
(Assume $M =$ mass of earth, $G =$ Universal gravitational constant)

Question

Question diagram: An object is kept at rest at a distance of 3 R above the ear

Options:

Answer:

A

Solution:

$P_{P} + k_{P} = P_{o} + k_{0} - \frac{GMm}{4 R} + \frac{1}{2} mV_{P}^{2} = 0 V_{P} = \frac{GM}{2 R}$
Choice 1

TestHub · Accepted Answer

​ P P ​ + k P ​ = P o ​ + k 0 ​ − 4 R GMm ​ + 2 1 ​ mV P 2 ​ = 0 V P ​ = 2 R GM ​ ​ ​ Choice 1

Physics - Gravitation Question with Solution | TestHub

Options:

Doubts & Discussion