One property that electromagnetic waves differ from other types of waves is that they can

a.) move particles in a medium
b.) travel in a vacuum
c.) transfer energy
d.) create a disturbance

wouldn't it be b, travel in a vacuum.

i think it's 35 meters

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.