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The first & second stage of two stage ro...

The first & second stage of two stage rocket separately weigh 100 kg and 10 kg and contain 800kg and 90kg fuel respectively. If the exhaust velocity of gases is 2 km/sec then velocity of rocket after second stage is (nearly) `(log_(10)5 =0.6990)` (neglect gravity)

A

`7.8 xx 10^3 m//s`

B

`9.3 xx 10^3 m//s `

C

`2.4 xx 10^3 m//s `

D

`6.1 xx 10^3 m//s`

Text Solution

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The correct Answer is:
A
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