Explain why a moving object cannot come to a stop instantly in zero seconds

The scientific term is Inertia.

"An object at rest stays at rest and an object in motion stays in motion with the same speed and in the same direction unless acted upon by an unbalanced force."

There isn't an unbalanced force that can stop something instantly.

The object must be decelerated, due to the momentum a moving object is carrying with it.

Well because it has momentum and it needs to be slowed down.