What will happen when you throw a ball in a moving bus: will it come back to you?
Suppose you are on a running bus and you have a tennis ball in your hand. You throw it up in the air. What will happen? Will it return back to you or it will go far beyond you as you are in a running bus?
Generally, if you were standing in a static position ( relative to the world), and if you have thrown the ball straight up to the sky, then the ball would have come back exactly to you. However, the case is not the same when you are in a running vehicle. That time you are moving from one place to another. Therefore, you think that after throwing the ball, the ball will fall down far beyond you as in this meantime you have traveled far from your previous position but the ball has fallen to the position from where you have thrown it.
However, this is a misconception. The truth is the ball will come exactly to you, whether you are in a running bus or standing on the road. I will tell you why!
For example, imagine your bus was going at a speed of 5 meters per second. you throw the ball up and it stayed 2 seconds in the air. So, in these 2 seconds, you have forwarded 2 X 5 = 10 meters. However, as the ball was in the air, it was supposed to be in the place from where you have thrown it: 10 meters behind. But, the thing is, when you have thrown the ball you were not in a static position. You and your hand had a speed of 5 m/s alike the bus. So, the ball had two speeds in two different directions: 5 m/s of speed toward the direction your bus was moving, and toward the sky at the speed of throwing the ball upward. So, when anything has two directions it will behave like a projectile.
As a result, when you were moving forward at a speed of 5 m/s, the ball was also moving at that speed in the air as well as moving upward and then downward with the speed you have thrown it. But it is not perceivable normally. That's why the ball will fall to you.
The good thing about Science is that it's true, whether or not you believe in it
