31. The theory of matter states that all particles of matter are in constant motion.

i think it's c. i'm not sure but i think so.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )