Explanation:
The paper plane slows down when flying in the air due to air resistance or the friction due to the air around it. As the paper plane have flat surfaces and more surface area, the air resists it's motion more than before. If the paper plane is moving towards left, then friction acts towards left.
The friction always act opposite to the direction of paper plane and resists its motion. Hence, we can say that paper plane slows due to Frictional Force
![\red{\bullet}](https://img.qammunity.org/2021/formulas/physics/college/rerf5ew3xz9w4ipv6eir2vdwza8v344vy7.png)
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