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A stone is dropped from a height equal t...

A stone is dropped from a height equal to `3R`, above the surface of earth. The velocity of stone on reaching the earth's surface is

A

`sqrtg(R/2)`

B

`sqrt(3/2gR)`

C

`sqrt(2gR)`

D

`sqrt(gR)`

Text Solution

Verified by Experts

The correct Answer is:
A
`1/2mv^(2)=((mg)Rh)/(R+h)=((mg)R(nR))/((R+nR))`
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NARAYNA-GRAVITATION-EXERCISE -II (H.W.)
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  2. A tunnel is dug along a diameter of the earth. Find the force on a par...

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  3. The mass of the earth is 9 times that of the mars. The radius of the e...

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  4. The escape velocity of a body from the earth is 11.2 km//s. If a body ...

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  5. A particle is kept at rest at a distance R (earth's radius) above the ...

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  6. 16 kg and 9kg are separated by 25m. The velocity with which a body sho...

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  7. The escape velocity from the earth is about 11 km/s. The escape veloci...

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  8. The escape velocity for a planet is ve. A particle starts from rest at...

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  9. The speed of a satellite that revolves around earth at a height 3R fro...

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  10. If an artificial satellite is moving in a circular orbit around earth ...

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  11. Two satellites A and B go around a planet in circular orbits of radii ...

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  12. A satellite is moving on a circular path of radius r around earth has ...

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  13. A satellite is orbiting the earth in an orbit with a velocity 4 km//s,...

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  14. A stone is dropped from a height equal to 3R, above the surface of ear...

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  15. If g is the acceleration due to gravity on the earth's surface, the ga...

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  16. The work done in bringing three particles each of mass 10 g from a lar...

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  17. The energy required to shift the body revolving around a planet from r...

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  18. By what percent the energy of the satellite has to be increased to shi...

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  19. At what height from the surface of the earth, the total energy of sate...

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  20. A point P (Rsqrt(3)m,0,) lies on the axis of a ring of mass M and radi...

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