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This is a three-answer problem! Please help me with step-by-step procedures; thank you so much!
A projectile is shot directly away from Earth's surface. Neglect the rotation of Earth. What multiple of Earth's radius Re gives the radial distance a projectile reaches if
(a) its initial speed is 0.500 of the escape speed from Earth
(b) its initial kinetic energy is 0.500 of the kinetic energy required to escape Earth
(c) What is the least initial mechanical energy required at launch if the projectile is to escape Earth?
A projectile is shot directly away from Earth's surface. Neglect the rotation of Earth. What multiple of Earth's radius Re gives the radial distance a projectile reaches if
(a) its initial speed is 0.500 of the escape speed from Earth
(b) its initial kinetic energy is 0.500 of the kinetic energy required to escape Earth
(c) What is the least initial mechanical energy required at launch if the projectile is to escape Earth?