Which of these experiments would make use of qualitative data?
a. a study of different surfaces to compare luster or shine
b. a study of different shapes to compare rolling frictions
c. a study on the change in freezing point of water when salt is added
d. a study on the effects of sunlight on the growth rate of plants

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