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A truck moving on a smooth horizontal surface with a uniform speed u is carrying stone-dust. If a mass Δm of the stone-dust leaks from the truck in a time Δt, the force needed to keep the truck moving at its uniform speed is

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A truck moving on a smooth horizontal surface with a uniform speed u is carrying stone-dust. If a mass Δm of the stone-dust leaks from the truck in a time Δt, the force needed to keep the truck moving at its uniform speed is





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