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Two persons A and B are standing at the ...

Two persons A and B are standing at the two opposite ends of a plank of length 4 m as shown in the figure. Plank is kept on a frictionless horizontal surface. Displacement of Plank, when A and B interchange their positions on the plank is (given `m_A=40` kg, `m_B= 60` kg, `m_(plank) = 20` kg)

A

`2/5` m

B

`2/3` m

C

`4/5`m

D

`4/3` m

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