Jupiter has a perihelion (closest distance to sun) of rp = 740 x 10⁶ km and an aphelion (most distant position from sun) of ra = 817 x 10⁶ km. With the information given below: 

a) Calculate Jupiter's period of revolution around the sun.

 b) What is its velocity at perihelion and aphelion?

 c) Explain your strategy to solve part (b) in words. What is your starting point or general concept? Which conservational laws do you use?

 Additional information: average distance sun - earth  = 150 x 10⁶ km, T_earth = 365 d, m_sun = 2 x 10³⁰ kg )