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)

Options

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

Answer

A