A credit card is set on top of a plastic tray and the tray is slowly accelerated across a table toward a waitress, taking the credit card with it. The patron of the restaurant pushing the tray does not touch the credit card. What type of force causes the credit card to accelerate? Draw a free body diagram and use it to explain your answer.

A credit card is set on top of a plastic tray and the tray is slowly accelerated across a table toward a waitress, taking the credit card with it. The patron of the restaurant pushing the tray does not touch the credit card. What type of force causes the credit card to accelerate? Draw a free body diagram and use it to explain your answer.

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