$A$ man of mass $M$ stands at one end of a plank of length $\ell$,which lies at rest on a frictionless surface. The man walks to the other end of the plank. If the mass of the plank is $3M$,what is the distance moved by the man relative to the ground?
- A$\frac{\ell}{4}$
- B$\frac{3\ell}{4}$
- C$\frac{2\ell}{3}$
- D$\frac{\ell}{3}$
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