Q127 / 160 · AP EAMCET 2008 · Physics

Two particles $A$ and $B$ initially at rest, move towards each other, under mutual force of attraction. At an instance when the speed of $A$ is $v$ and speed of $B$ is $2 v$, the speed of centre of mass $(\mathrm{CM})$ is

  • Correct answer
    A
    Zero
  • B
    $v$
  • C
    $2.5v$
  • D
    $4v$

Solution

As initially both the particles were at rest therefore velocity of centre of mass was zero and there is no external force on the system so speed of centre of mass remains constant $i e$, it should be equal to zero.

Hence, the correct answer is option: 'A'.

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