Semi-major axis , specific mechanical energy, its period and velocity at Apogee and Perigee and what the difference is [closed]

Hi im needing some help with two questions could you please show the formula and the way its solved?Thanks PS:Could you also explain what the difference of velocity and apogee and perigee?

1.)A satellite’s orbit is at a 45 degree inclination. It has a perigee altitude of 400 kilometers and an apogee altitude 2000 kilometers. It has an angular momentum of 54,653.38 km2/sec. What are its semi-major axis and its specific mechanical energy, its period and velocity at Apogee and Perigee?

2.)A satellite’s orbit has a period of 55.555 hours, and a semilatus rectum of 72,254.4 km. What is the orbit’s eccentricity?

closed as off-topic by user10851, ACuriousMind♦, John Rennie, Qmechanic♦Mar 2 '16 at 7:29

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