An open cart on a level surface is rolling without frictional loss through a ver

Question

An open cart on a level surface is rolling without frictional loss through a vertical downpour of rain, as shown above. As the cart rolls, an appreciable amount of rainwater accumulates in the cart. The speed of the cart will (A) increase because of conservation of momentum (B) increase because of conservation of mechanical energy (C) decrease because of conservation of momentum (D) decrease because of conservation of mechanical energy (E) remain the same because the raindrops are falling perpendicular to the direction of the cart's motion

Explanation / Answer

Decrease because conservation of momentum

momentum = mass x velocity

as momentum is conserved and mass increases velocity will decrease

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