Problem: A projectile is launched vertically from the surface of the earth with an initial speed v0 = 6.43 km/s.
Part I: What is the magnitude of its acceleration (m/s2 ) 1620 km above the surface of the earth?
Part II: At what height (km) will it stop and begin to fall back to the surface of the earth?
I need expert help to solve the adobe problem. Use laws of universal gravitation.