1.

At a certain instant of time the mass of a rocket going up vertically is 100 kg. If it is ejecting 5 kg of gas per second at a speed of 400 m/s, the acceleration of the rocket would be (taking \[g=10\,m/{{s}^{2}})\]     [NCERT 1984]

A.       \[20\,m/{{s}^{2}}\]   
B.      \[10\,m/{{s}^{2}}\]
C.       \[2\,m/{{s}^{2}}\]
D.      \[1\,m/{{s}^{2}}\]
Answer» C.       \[2\,m/{{s}^{2}}\]


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