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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 at the left end of the plank. Surface of the plank is smooth. System is initially at rest and masses are as shown in the figure. A and B starts moving such that the position of B remains fixed with respect to ground then A meets B. Then the point where A meets B is located at- A.the middle of the plank B.30cm from the left end of the plank C.the right end of the plank

Two men A and B are standing on a plank. B is at the middle of the plank and A is at the left end of the plank. Surface of the plank is smooth. System is initially at rest and masses are as shown in the figure. A and B starts moving such that the position of B remains fixed with respect to ground then A meets B. Then the point where A meets B is located at-
A.the middle of the plank
B.30cm from the left end of the plank
C.the right end of the plank

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Grade:11

1 Answers

Sheshank
14 Points
5 years ago
Taking the origin at the centre of the plank. M1X1+M2X2 +M3X3=0(as change in position of centre of mass is 0) 
Putting the data in the above equation we get 60(0)+40(60)+40(-x)=0
=>X=60cm 
Therefore A and B meet at the right end of the plqnk.

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