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The pilot of an aircraft, who is not tie...

The pilot of an aircraft, who is not tied to his seat, can loop a vertical circle in air without falling out at the top of the loop. What is the minimum speed required so that he can successfully negotiate a loop of radius 4 km ?

A

100 `m//s`

B

200 `m//s`

C

30 `m//s`

D

400 `m//s`

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