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A rocket is fired with a speed v = 2sqrt...

A rocket is fired with a speed v = 2`sqrt (gR)` near the earth's surface and directed upward, what is intersteller speed of rocket `v^'`, where `v_e` escape speed on the surface of earth

A

`v^'` = `v_e`

B

`v^'` = `sqrt 2``v_e`

C

`v^'` lt `v_e`

D

`v^'` gt `v_e`

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