The mass of a planet is $\frac{1}{10}^{\text {th }}$ that of the earth and its diameter is half that of the earth. The acceleration due to gravity on that planet is:
- A$9.8 \mathrm{~m} \mathrm{~s}^{-2}$
- B$4.9 \mathrm{~m} \mathrm{~s}^{-2}$
- ✓$3.92 \mathrm{~m} \mathrm{~s}^{-2}$
- D$19.6 \mathrm{~m} \mathrm{~s}^{-2}$
Answer: C.
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