Power to keep a conveyor belt moving while sand falls on it

1. A.
   $1.25\text{ }W$
2. B.
   $2.5\text{ }W$
3. C.
   $6.25\text{ }W$
4. D.
   $12.5\text{ }W$

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1. A.
   $P^{2} \propto v^{3}$
2. B.
   $P \propto \sqrt{v}$
3. C.
   $P \propto v$
4. D.
   $P^{2} \propto v^{5}$

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