# Gravitational Potential Energy: Changing Kinetic Energy

A projectile is given a vertical upward velocity Vo = 10000 m/sec at Earth's surface. Neglect air friction. Find the maximum distance it will achieve above the surface of Earth. Do not consider g to be constant.

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Physics notes:

Note: The starting point for this problem could be either of two choices.

FIRST METHOD OF CHOICE:

Note 1.

Start with the expression giving the gravitational PE of two bodies of mass M and m, separated by center to center distance r, which is expressed by:

(1) P.E. = - G M m/r

Note that this quantity is negative because the P.E. is defined to be zero when the separation r is infinite. Therefore if r increases from some initial value, then for the P.E. to approach zero, it has to initially be a negative value.

Note 2.

By conservation of energy, as the projectile ...