13. a) Describe in one short sentence what is 'escape speed'? b) Starting with the conservation of energy equation, AK+AU = 0, derive an equation for the escape speed, Ve, of any object of mass m from any planet of mass Mp and radius Rp. c) As an example, calculate the escape speed from Earth. Useful constants: ME = 5.98 x 102 kg Rg= 6380km G=6.67 x 10-Nmkg 2 14. Put the 'orbital speed' and the 'escape speed' formulas next to each other and circle what is different between them.