(i) As escape velocity does not depend upon mass of the body, therefore, value of escape velocity from the surafce of earth for both the bodies is same `(= 11 km//sec)`.
No, the energy required in the two cases shell not the same. This is because, energy required `= (1)/(2) m V_(E)^(2)`, which is directly proportional to `m`. For body of mass `20 kg`, energy required is `10` times the energy required for body of mass `2 kg`.
(ii) From this study, we learn that everything has a price. You pay the price and get the thing. If you are not able to affored the price of something, you cannot get it. This is so true for anything and everthing in life.