Construction workers were raising heavy steel beams up 10 meters, unfortunately, they dropped them. as the beams fell towards the ground the energy they possessed at 10 meters above the street was converted into energy.

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge

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.