$A$ body,under the action of a force $\vec F = 6\hat i - 8\hat j + 10\hat k$,acquires an acceleration of $1\, m/s^2$. The mass of this body must be
- A$15\,kg$
- B$20\,kg$
- C$10\sqrt 2 \,kg$
- D$2\sqrt {10} \,kg$
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