A rocket of mass 40 kg has 160 kg fuel

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A rocket of mass 40 kg has 160 kg fuel. The exhaust velocity of the fuel is

2\,\text{km s}^{-1}

. The rate of consumption of fuel is

4\,\text{kg s}^{-1}

. Calculate the ultimate vertical speed gained by the rocket. (1)

2.82\,\text{km s}^{-1}

(2)

4.82\,\text{km s}^{-1}

(3)

3.61\,\text{km s}^{-1}

(4)

5.62\,\text{km s}^{-1}