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When sound is produced in an aeroplane m...

When sound is produced in an aeroplane moving With a velocity of 200. m/s horizontally its echo is heard after 10`sqrt 5` seconds. If velocity of sound in air is 300 m`s^-1` theielevation of aeroplane is

A

1250 m

B

250 m

C

2500 m

D

250`sqrt 5`m

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