In a rocket of mass 1000 kg fuel is consumed at a rate of 40 kg/s. The velocity of the gas ejected from the rocket is \[\text{5}\times \text{1}{{0}^{\text{4}}}\] m/s. The thrust on the rocket is

• A.  \[2\times {{10}^{3}}N\]                               
• B.  \[5\times {{10}^{4}}N\]
• C.  \[2\times {{10}^{6}}N\]               
• D.  \[2\times {{10}^{8}}N\]