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# Two men ‘A’ and ‘B’ are standing on a plank. ‘B’ is at the middle of the plank and ‘A’ is the left end of the plank. The surface between plank and ground is smooth. System is initially at rest and masses are as shown in figure. ‘A’ and ‘B’ starts moving such that the position of ‘B’ remains fixed with respect to ground. Then the point where A meets B is located at

- the middle of the plank
- 30 cm from the left end of the plank
- the right end of the plank
- None of these

## The correct answer is: the middle of the plank

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