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A rocket weighing 9000 N fired vertically upward. The gases are expelled at a rate of $20 K g s^{- 1}$ with a speed of 0.5 km/s. If the rocket weighs 6000 N at the burn out, them the net upward force n the rocket at fire off should be
$10^{3} N$
$10^{4} N$
$10^{5} N$
$10^{6} N$

A

10^{5} N

B

10^{3} N

C

10^{6} N

D

10^{4} N

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