A truck moving on a smooth horizontal surface with a uniform speed 'u' is carrying stone-dust. If a mass $Δ m$ of the stone-dust `leaks down’ from the truck in the time $Δ t$ , the force needed to keep the truck moving at its uniform speed is

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Solution

The correct option is D
The force exerted on the truck due to leaking stone dust is $\frac{Δ m}{Δ t}$ in the vertically upward direction.
Since there is no friction, no force is needed to keep the truck moving with a constant speed in the horizontal direction. Hence the correct choice is (d).

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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 down’ from the truck in the time Δt, the force needed to keep the truck moving at its uniform speed is

The correct option is D The force exerted on the truck due to leaking stone dust is ΔmΔt in the vertically upward direction. Since there is no friction, no force is needed to keep the truck moving with a constant speed in the horizontal direction. Hence the correct choice is (d).

A truck moving on a smooth horizontal surface with a uniform speed 'u' is carrying stone-dust. If a mass $Δ m$ of the stone-dust `leaks down’ from the truck in the time $Δ t$ , the force needed to keep the truck moving at its uniform speed is

The correct option is D
The force exerted on the truck due to leaking stone dust is $\frac{Δ m}{Δ t}$ in the vertically upward direction.
Since there is no friction, no force is needed to keep the truck moving with a constant speed in the horizontal direction. Hence the correct choice is (d).