A ball initially at rest rolls down a hill and has an acceleration of 3.3 m/s^2 . If it accelerates for 7.5s , how far will it move during this time?

False

Explanation: Circular orbits were introduced by the heliocentric theory.

Were the circular orbits are introduced by the "perfection" of the shape, and because by the observations the scientifics of the time knowed that the orbits were circle like, so assuming that the orbits were perfect circles had sense, so the fact that the earth was round has nothing to se with this.