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A projectile is launched vertically from the surface of the earth with an initial speed ?0=6.23...

A projectile is launched vertically from the surface of the earth with an initial speed ?0=6.23 km/s. The mass of the earth is 5.97×1024 kg, the radius of the earth is 6.37×106 m, and ?=6.674×10−11.

(a) What is the magnitude of the projectile's acceleration 1.63e3 km above the surface of the earth?

(b) At what height will the projectile stop and begin to fall back to the surface of the earth?

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