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7. gravitation — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics7. gravitation1 Mark
MCQ
Two masses $m_1$ and $m_2\, (m_1 < m_2)$ are released from rest from a finite distance. They start under their mutual gravitational attraction
  • ✓
    acceleration of $m_1$ is more than that of $m_2$
  • B
    acceleration of $m_2$ is more than that of $m_1$
  • C
    centre of mass of system will remain at rest in all the reference frame
  • D
    total energy of system does not remain constant
✓

Answer

Correct option: A.
acceleration of $m_1$ is more than that of $m_2$
a
Same force acts on both masses

Hence $a \propto \frac{1}{{\,m}}$           $\left( {F = ma} \right)$

In absence of external force (remember mutual gravitational force is an internal force for the system) total energy remains constant.

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