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Question

Two carts on horizontal straight rails are pushed apart by an explosion of a point charge Q placed between the carts. Suppose the coefficient of friction of the two are equal and 200 kg cart travels a distance of 36 m and stops. The distance covered by the cart weighing 300 kg is
  1. 12 m
  2. 16 m
  3. 24 m
  4. 32 m


Solution

The correct option is C 24 m
Since net external force on the system containing the two masses is zero, the position of centre of mass does not change.
m1s1=m2s2
300×s1=200×36
s1=24 m

 
Why this question?

"In the absence of an external force on a system, the position of centre of mass of a system is unaltered no matter how the internal forces act."

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