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If a projectile is fired straight up from the earth’s surface, what
would happen if the total mechanical energy (kinetic plus potential) is
(a) less than zero, and (b) greater than zero? In each case, ignore air
resistance and the gravitational effects of the sun, the moon, and the
other planets.

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If a projectile is fired straight up from the earth’s surface, what would happen if the total mechanical energy (kinetic plus potential) is (a) less than zero, and (b) greater than zero? In each case, ignore air resistance and the gravitational effects of the sun, the moon, and the other planets.