13. Which situation will produce the greatest change of momentum for a 1.0-kilogram cart?
A) accelerating it from rest to 3.0 m/s
B) accelerating it from 2.0 m/s to 4.0 m/s
C) applying a net force of 5.0 N for 2.0 s
D) applying a net force of 10.0 N for 0.5 s
Answer Here:

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ