Answer:
This means that the earth is having gravity which means that anything that goes up always comes down. For example u throw a ball up in the sky and u will see that it will come back after some time. It is done by the force of gravity. The gravitational force pulls everything.
The statement "all that goes up must come down" can be taken literally when thinking in terms of physics. Since all the objects in Earth are subjected to its gravitational pull, we should expect that everything with not enough force to overcome the earth's gravity will always land back on the surface.
Moreover, such statement can be demonstrated by objects in a projectile motion. An object thrown upwards, will slowly go down as its velocity is subjected to a negative acceleration that is caused by the earth's gravity. As time goes, its initial velocity will eventually be zeroed reaching its highest point in the y-axis. Beyond such point, gravitational acceleration will be the only force working on the object until it lands on the earth's surface again. This is guided by a mathematical equation final velocity = initial velocity + acceleration multiplied by time elapsed.
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