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Two children A and B of same mass (inclu...

Two children `A` and `B` of same mass (including their caps) `M` are sitting On a see-saw as shown in Fig. Initially, the beam is horizontal. At once, child `B` throws away his cap (mass `M/25`) which falls at point `Q`, midpoint of the left half of the beam, due to this the balance of beam is disturbed. To balance it again what is the mass in required to be put at point `P` on the right half of the beam?

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