$A$ rocket has an initial mass of $20 \times 10^3 \, kg$. If it is to blast off with an initial acceleration of $4 \, m/s^2$,the initial thrust needed is $(g = 10 \, m/s^2)$.
- A$6 \times 10^4 \, N$
- B$28 \times 10^4 \, N$
- C$20 \times 10^4 \, N$
- D$12 \times 10^4 \, N$
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