On a horizontal frictionless frozen lake, a girl of 36kg and a box of 9kg are connected to each other by means of a rope. Initially they are 20m apart. The girl exerts a horizontal force on the box, pulling it towards her. How far has the girl travelled when she meets the box.
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Answer:
Correct option (D) 4m
Explanation:
∴ external force does not work on system
So according to concept of mass
36 x = 9 × (20 – x) x = 4m
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