Physics

Problem

A planet revolves round the Sun with semi-major axis

a = 1.5\times10^{11}\,\text{m}

and eccentricity

e = 0.2

. Its speed at aphelion is observed to be

20\,\text{km}\,\text{s}^{-1}

. a. (i) Calculate its distance from the Sun at perihelion and at aphelion. b. (ii) Determine its speed at perihelion.