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JEE Advanced 2009Paper 1
Exam
JEE Advanced
Year
2009
Paper
Paper 1
Subject
Physics
Chapter
Center of Mass, Momentum and Collision

JEE Advanced 2009 · Paper 1 · Physics · Center of Mass, Momentum and Collision

Two small particles of equal masses start moving in opposite...

Two small particles of equal masses start moving in opposite directions from a point AA in a horizontal circular orbit. Their tangential velocities are vv and 2v2 v respectively, as shown in the figure. Between collisions, the particles move with constant speeds. After making how many elastic collisions, other than that at AA, these two particles will again reach the point AA ? Two small particles of equal masses start moving in opposite directions from a point A in a horizontal circular orbit.

Options

  1. A4
  2. B3
  3. C2
  4. D1

Correct answer

C. 2

Step-by-step solution

At first collision one particle having speed 2v2 v will rotate 240∘240^{\circ}\left(\right. or \left.\frac{4 \pi}{3}\right)whileotherparticlehavingspeedwhile other particle having speedvwillrotatewill rotate120^{\circ}(or2π3)(or \left.\frac{2 \pi}{3}\right). At first collision they will exchange their velocities. Now as shown in figure, after two collisions they will again reach at point AA. Two small particles of equal masses start moving in opposite directions from a point A in a horizontal circular orbit.
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