A toy lorry moves at constant velocity 3ms-1 on a smooth horizontal surface.If sand is dropped perpendicularly on the toy lorry at the rate of 80kg per minute.What is the horizontal force required to maintain the movement of the toy lorry at constant velocity 3ms-1 ?
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Explanation:
On smooth horizontal road there is no friction.
The sand falling from the truck in the vertical downwards direction, exerts force on the truck in the vertically upward direction due to change in momentum. So no force is required to maintain the speed u in horizontal direction.
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