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10 June, 02:51

A 50 kg woman and an 80 kg man stand 12.0 m apart on frictionless ice.

(a) How far from the woman is their CM?

m

(b) If each holds one end of a rope, and the man pulls on the rope so that he moves 1.3 m, how far from the woman will he be now?

m

(c) How far will the man have moved when he collides with the woman?

m

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Answers (1)
  1. 10 June, 06:23
    0
    Given that

    m₁ = 50 kg

    m₂=80 kg

    d = 12 m

    a)

    We know that center of mass given as

    X = (x₁m₁+x₂m₂) / (m₁+m₂)

    Lets take distance of CM from woman is X

    So now by putting the value

    X = (0 x 50+12 x 80) / (50+80)

    x=7.38 m

    b)

    There is no any external force so the CM will not move.

    So we can say that

    x₁m₁+x₂m₂ = 0

    50 (x) - 80 (1.3) = 0

    x=2.08

    So the distance move by woman d=12-2.08-1.3=8.62 m

    d=8.62 m

    c) lets take distance move by man is x

    50 (x) - 80 (12-x) = 0

    x=7.38

    So the distance move by woman d=12-7.38

    d=4.62 m
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