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Physics - Gravitation Question with Solution | TestHub

PhysicsGravitationEnergy & PotentialEasy2 minPYQ_2022

PhysicsEasysingle choice

A body of mass $m$ is dropped from a height $\frac{R}{2}$ , from the surface of earth where $R$ is radius of earth. Its speed when it will hit the earth's surface is $(v_{e} =$ escape $v$ elocity from earth' surface)

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Answer:

Solution:

Considering the total energy conservation: $- \frac{GM m}{R + \frac{R}{2}} = - \frac{GM m}{R} + \frac{1}{2} m v^{2} \Rightarrow v = \frac{2 GM}{3 R} = \frac{v _{e}}{3}$

Stream:MHT_CETSubject:PhysicsTopic:GravitationSubtopic:Energy & Potential

⏱ 2mℹ️ Source: PYQ_2022

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