Copernicus came up with what model where the sun was in the center of the solar system

The friction of the water on a boat produces an acceleration of -10. m/s2. if the boat is traveling at 30. m/s and the motor is shut off, how long it take the boat to slow down to 5.0 m/s?

Which statements did both aristotle and ptolemy assume? check all that apply.

The flow of electrons from one atom to another is called