In the history of astronomy, which of the following is true? . a] tycho brahe built one of the first observatories. b] ptolemy was criticized for his work on the heliocentric model. c] nicolaus copernicus argued that the sun was the center of the universe. d] johannes kepler argued that earth was the center of the universe. .

III. It travels as a projectile in a gravitational field with negligible air resistance.

Explanation:

In this case, the body is under the effect of a force, therefore, it accelerates. This is due to the gravitational field, which is independent of its mass. Therefore, the body is under the effect of the acceleration of gravity, which is constant throughout the trip.