Reason of dropping a coin straight into the glass by removing a card suddenly?

According to Newton's law of motion, If no external force is applied on a body, a stationary body will remain stationary and a moving body will continue to move without changing its speed. So a body continues to do whatever it happens to be doing unless a force is exerted upon it. In the absence of net forces, a moving body tends to move along a straight-line path indefinitely. It is the property of the body to resist changes in motion that is widely known as inertia. To show the property of that body experimentally, a card is put on the top of a glass with a coin on the upper face of the card. Now If we accelerate the card with a force, the coin will drop straight into the glass. As we said earlier, a stationary body continues to remain stationary due to inertia. As the coin was initially in stationary state, after removing the card very rapidly, it wanted to continue its state of rest. That is why it dropped straight into the glass.