Two bodies of masses 2 kg and 4 kg are moving with velocities 20 ${\rm{m}}{{\rm{s}}^{ - 1}}$ and 10 ${\rm{m}}{{\rm{s}}^{ - 1}}$ towards each other due to mutual gravitation attraction. What is the velocity of their centre of mass?

JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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Two bodies of masses 2 kg and 4 kg are moving with velocities 20

\mathrm{m}{\mathrm{s}^{ - 1}}

and 10

\mathrm{m}{\mathrm{s}^{ - 1}}

towards each other due to mutual gravitation attraction. What is the velocity of their centre of mass?

View answer and explanation

Correct option: D

Zero

Option D (Zero) is correct because the net external force on the system is zero, so the velocity of the center of mass remains constant.

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\mathrm{AB}

\mathrm{L}

\mu(x)=a+\frac{b x}{L}

x

\mathrm{A}

\mathrm{CM}

\left(\frac{7}{12}\right) \mathrm{L}

\mathrm{A}

\mathrm{b}

1.0 \mathrm{~g}

8 \mathrm{~cm}

\omega = {t^4} + 2{t^3}

t = 1\,sec

\left( {rad\,{s^{ - 2}}} \right)