Home Physics Work, Energy, Power and Collision Mix Consider a system of three particles, each o…
Physics Work, Energy, Power and Collision Mix MCQ (Single Correct)

Consider a system of three particles, each of mass 0.1 kg, which remains always in the same xy – plane. The particles interact among themselves, always in a manner consistent with Newton’s third law. The particles A, B and C have positions at various times having equal intervals as given in the table.

A
Net external force acting on the system is zero.
B
Net external force acting on the system is 2.0 N.
C
Net external force acting on the system is 4.6 N.
D
Information provided is not sufficient to draw the conclusion.

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The correct answer is:
A

Similarly

And

Thus it is obvious that COM is moving along line X = Y and distances between t = 0 to t = 1 to t = 2 are equal.

i.e. COM is moving with constant velocity.

Net external force on the system is zero.

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