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