The fact that the galaxies are rotating at about the same velocity from the center to the edge as opposed to faster near the centers is evidence that .. a. there must be more gravity than that calculated from normal Mass
b. they are rotating slower over time
c. dark energy is pulling on them
d. they are measuring the velocities incorrectly ​

A250-n box is at rest on a frictionless horizotal floor. then a person shoves the box with a non-zero force of magnitude p. which statement best describes the relationship betweeen p and the motion of the box after it was shoved? -the box will not move when p< 250n but otherwise will accelerate at a constant rate that is directly proportional to p - the box will begin moving at a speed that is directly proportional to p, then will gradually slow to a halt -the box will move with constant velocity at a speed that is directly proportional to p -box will accelerate across the floor at a constant rate that is directly proportional to p