if i flip a coin, will the coin stop moving upwards first before it starts to move down? in other words, is there a moment when the coin is not moving at all?

why?

It stops and has velocity equal to zero at the top.

ok.

To understand the motion of a coin when flipped, we can break it down into different stages.

Initially, when the coin is held between your fingers and you release it, gravity begins acting on it, pulling it downwards. As the coin moves downwards, it gains momentum due to its initial push and gravity's pull.

As the coin continues its descent, it eventually reaches its lowest point, which is the peak of its upward motion. At this point, gravity has slowed down the coin's ascent until it comes to a momentary stop. This is when the coin's velocity becomes zero, as it changes direction from moving up to moving down.

The reason the coin stops momentarily at the highest point is due to the change in its acceleration. As gravity pulls the coin downwards, it gradually reduces its upward velocity until it reaches zero. Then, as it continues to move in the downward direction, gravity accelerates it further downwards.

Therefore, to answer your question, yes, there is a moment when the coin is not moving at all. It briefly comes to a stop at the highest point of its motion before changing direction and moving downwards.