If the potential energy of a box is 600 joules because it is stored on a shelf at a position of 4 meters, what is the object's mass?

c because the news are a source of information of things that happen on the daily and shows evidence about that particular topic

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.