Question

a man of mass m stand at a left end of a uniform plank length lo and mass 2m, which lies on frictional less surface .... distance travelled by man with respect to ground is?​

Answer 1

Explanation:

Let distance moved by the planck be x, then wrt ground the man will move by a distance L−x

Now the net displacement of the centre of mass will be zero in ground frame

M(L−x)=M∗x/3

x=3∗L/4

(L−x)=L/4

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