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Concepts Of Physics MCQ Edition [Volume 1]
Exam
Concepts Of Physics MCQ Edition [Volume 1]
Subject
Physics
Chapter
Centre of Mass, Linear momentum, Collision

Concepts Of Physics MCQ Edition [Volume 1] · Physics · Centre of Mass, Linear momentum, Collision

Imagine a system composed of two identical particles. One particle...

Imagine a system composed of two identical particles. One particle is stationary while the other possesses an acceleration a⃗\vec{a}. The acceleration of the centre of mass is

Options

  1. A2a⃗2\vec{a}
  2. Bzero
  3. C12a⃗\dfrac{1}{2}\vec{a}
  4. Da⃗\vec{a}

Correct answer

C. 12a⃗\dfrac{1}{2}\vec{a}

Step-by-step solution

Let the mass of each identical particle be mm.

The acceleration of the first particle is a⃗1=0\vec{a}_{1} = 0.

The acceleration of the second particle is a⃗2=a⃗\vec{a}_{2} = \vec{a}.

The acceleration of the centre of mass of the system is given by the formula:

a⃗cm=m1a⃗1+m2a⃗2m1+m2\vec{a}_{cm} = \dfrac{m_{1}\vec{a}_{1} + m_{2}\vec{a}_{2}}{m_{1} + m_{2}}

Substituting the values, we get:

a⃗cm=m(0)+m(a⃗)m+m\vec{a}_{cm} = \dfrac{m(0) + m(\vec{a})}{m + m}

a⃗cm=ma⃗2m=12a⃗\vec{a}_{cm} = \dfrac{m\vec{a}}{2m} = \dfrac{1}{2}\vec{a}
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