Two men ‘A’ and ‘B’ are standing on a plank. ‘B’ is at the middle… - Vidyadip

MCQ

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. 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 till $‘A’$ meets $‘B’$ . Then the point where $A$ meets $B$ is located at

A
The middle of the plank
B
$30\ cm$ from the left end of the plank
✓
The right end of the plank
D
None of these

✓

Answer

Correct option: C.

The right end of the plank

c
$0$ = $40 S_A$ + $40S_P$
$S_A$ = $-S_P$ = $60\ cm$
$S_P$ = $-60\ cm$

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