You are in a train traveling on a horizontal track and notice that a piece of luggage starts to slide directly toward the front
of the train. From this observation, you can conclude that this train is:__________ A) Slowing down
B) Slowing down and changing direction
C) Speeding up and changing direction
D) Speeding up
E) Changing Direction
If there is air, then an object with greater mass falls toward Earth at a greater acceleration because it encounters less air resistance than if it had a smaller mass. There is no air resistance if there is no air, so they'll fall at the same acceleration.