If two materials are made from different kinds of atomd, what else should you expect to be different? A. their charge of their protons
B. The mass of their electrons
C. the kinds of neutrons
D. the properties they have

the properties they have

Explanation:

I do not think protons have different charges, electrons weigh different, or there are multiple types of neutrons.

i think if it were me i whould divide 300 dide 15

step-by-step explanation:

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.