In the first second of its flight, rocket ejects \( 1 / 60 \) of its mass with a velocity of \( ...

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In the first second of its flight, rocket ejects \( 1 / 60 \) of its mass with a velocity of \( 2400 \mathrm{~ms}^{-1} \). The acceleration of the rocket is
[BHU 2006]
(a) \( 19.6 \mathrm{~ms}^{-2} \)
(b) \( 30.2 \mathrm{~ms}^{-2} \)
(c) \( 40 \mathrm{~ms}^{-2} \)
(d) \( 49.8 \mathrm{~ms}^{-2} \)
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