As shown in the figure, when the gravity mg rotates downward, there will be a velocity Vo as shown in the figure, which can be regarded as a vertical downward component motion V2 and a horizontal right V 1. At the moment of falling to the desktop and being bounced off the desktop, the card disappears due to the friction of the desktop, and the card slides horizontally forward at V 1. But after falling on the table, it will be stopped by the friction of the table.

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