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Find rocket thrust, inteval between ignition and lift-off

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A rocket stands vertically on a launching pad, the mass of the fuel and the rocket is 1.9*10^3 kg. On ignition, gas is ejected from the rocket at a speed of 2.5*10^3 m/s relative to the rocket, and fuel is consumed at a constant rate of 7.4 kg/s. Find the thrust of the rocket and hence explain why there is an interval between ignition and lift-off. (take g=10 m/s^2).

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The expert finds the rocket thrust and the interval between ignition and lift-off.

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A rocket stands vertically on a launching pad, the mass of the fuel and the rocket is 1.9x103 kg. On ignition, gas is ejected from the rocket at a speed of 2.5x103 m/s relative to the rocket and fuel is consumed at a constant rate of 7.4 kg/s. Find the thrust of the rocket and hence explain why there is an interval between ignition and lift-off. (take g=10 m/s^2).

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