The Chandra X-ray observatory, launched in 1999, achieved an elliptical orbit of minimum altitude 10 000 km

Question:

The Chandra X-ray observatory, launched in 1999, achieved an elliptical orbit of minimum altitude 10 000 km and maximum altitude 140 000 km above the surface of the earth. Assuming that the observatory was transferred to this orbit from a circular orbit of altitude 10 000 km at point A, determine

(a) The increase in speed required at A,

(b) The speed of the observatory atB.