13–127. An elliptical path of a satellite has an eccentricity e = 0.130. If it has a speed of 15 Mm>h when it is at perigee, P, determine its speed when it arrives at apogee, A. Also, how far is it from the earth’s surface when it is at A?
13–129. The rocket is traveling in a free flight along an elliptical trajectory A 'A . The planet has no atmosphere, and its mass is 0.60 times that of the earth. If the rocket has the
orbit shown, determine the rocket’s velocity when it is at point A.
13–130. If the rocket is to land on the surface of the planet, determine the required free-flight speed it must have at A ' so that the landing occurs at B. How long does it take for the rocket to land, going from A ' to B? The planet has no atmosphere, and its mass is 0.6 times that of the earth.
