A) zero
B) \[u\frac{\Delta m}{\Delta t}\]
C) \[\Delta m\times \frac{du}{dt}\]
D) \[u\frac{\Delta m}{\Delta t}+\Delta m\times \frac{du}{dt}\]
Correct Answer: A
Solution :
The force exerted on the truck due to leaking of dust is \[\frac{\Delta m}{\Delta t}\times {{v}_{r}}\] in horizontal direction. Since there is no friction, no horizontal force acts on the truck hence no force is required to keep its uniform motion intact
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