Question

How much energy will be necessary for making a body of 500 kg escape from the earth

, radius of earth $\left. = 6.4 \times 10 ^ { 6 } \mathrm {~m} \right]$

• A. About
• B. About
• C. About
• D. About

Answer 1

Answer: (C)

About

Answer 2

Potential energy of a body at the surface of earth

$P E = - \frac { G M m } { R } = - \frac { g R ^ { 2 } m } { R }$= $- m g R$

= $- 500 \times 9.8 \times 6.4 \times 10 ^ { 6 }$=

So if we give this amount of energy in the form of kinetic energy then body escape from the earth.