Which statement is true?
a. kepler’s laws apply only to the motion of earth.
b. kepler’s laws can be used to predict eclipses.
c. kepler’s laws are true for a central force that is directly proportional to distance. d. kepler’s laws can be deduced from newton’s laws of motion and gravity.

what type of charge does it have? negative

what was the acceleration of the 2 kg cart?

⇒ 16.0 cm/s2

what was the acceleration of the 4 kg cart?

⇒ 8.1 cm/s2

what was the acceleration of the 6 kg cart?

⇒ 5.3 cm/s2

a.) travels faster in solids because the particles are closer together.

air is a gas water is a liquid