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AP EAMCET201822 Apr 2018Evening ShiftPhysicsCenter of Mass, Momentum and CollisionActual

Two particles of masses in the ratio 1: 2 are placed along a vertical line. The lighter particle is raised through a height of 9 ~cm . To raise the centre of mass of the system by 2 cm , the heavier particle should be

Options

  1. Amoved 1.5 cm downward
  2. Bmoved 2 cm upward
  3. Cmoved 1.5 cm upward
  4. Dmoved 2 cm downward

Correct answer

A. moved 1.5 cm downward

Step-by-step solution

Let initially particles are at origin, their masses are m and 2 m . aligned 2 & = m 9+2 m y₂ 3 m 2 & = 9+2 y₂ 3 y₂ & =-1.5 ~cm aligned So, second particle must be moved 1.5 ~cm downward.

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