All the following statements are true. which one follows directly from kepler's third law?

a) venus orbits the sun at a slower average speed than mercury.
b) venus is more massive than mercury.
c) venus has a thicker atmosphere than mercury.
d) venus is farther from the sun than mercury.

Which of the following situations is impossible? a) an object has velocity directed east and acceleration directed east. b) an object has zero velocity but non-zero acceleration. c) an object has constant non-zero velocity and changing acceleration. d) an object has velocity directed east and acceleration directed west. e) an object has constant non-zero acceleration and changing velocity.