Haley’s Comet is going around the Sun in a highly elliptical orbit with a period of 76 y. It was closest to the sun in the year 1987 (I was 13 year old then and heard a lot about it n radio). In which year of `21^(st)` century do you expect it to have least kinetic energy?

Answer

`4xx10^(16)m^(2)s^(-s)`