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The initial thrust of the blast is:

1. $3.5 \times 10^5\,\text{N}$
2. $7.0 \times 10^5\,\text{N}$
3. $14.0 \times 10^5\,\text{N}$
4. $1.75 \times 10^5\,\text{N}$

Correct answer: $7.0 \times 10^5\,\text{N}$

Solution

The initial thrust of a blast or rocket is found from $F=\dot{m}v_{rel}$. Using the given data in the source problem leads to $7.0\times10^5\,\text{N}$.

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