• # question_answer 14) If the escape velocity of a body of mass 2 Kg for a planet is 9 km/sec. Then the potential energy of the body on planet's surface will be:- A)  $-81\,MJ$          B)  $-81\text{ }KJ$C)  $-81\text{ }J$            D)  $~-162\text{ }MJ$

$Potential\text{ }Energy=-Escupe\,\,Energy$ $=-\frac{1}{2}m{{v}_{c}}^{2}$ $=-\frac{1}{2}\,(2)\,\,\,{{(9\times {{10}^{3}})}^{2}}$ $=-81\times {{10}^{6}}\,J$