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The P.E. and K.E. of a helicopter flying...

The P.E. and K.E. of a helicopter flying horizontally at a height of 400 m are in the ratio 5:2 . The velocity of the helicopter is

A

(a) 28m/s

B

(b) 14m/s

C

(c) 56m/s

D

(d) 30m/s

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