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A particle is thrown vertically upwards upwards with velocity `11.2" km s"^(-1)` from the surface of earth. Calculate its velocity at height 3 R. Where R is the radius of earth.

A

`cong 9.25` km/s

B

`cong 5.6` km/s

C

`cong 11.2` km/s

D

`cong 4.3` km/s

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The correct Answer is:
B
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