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 find velocity of rocket (nearly) (`log_(10)5=0.6990`) (neglect gravity)

`7.8 xx 10^(3) m//s`

`9.3 xx 10^(3) m//s`

`2.4 xx 10^(3) m//s`

`6.1 xx 10^(3) m//s`

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