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If \( \mathrm{V}_{\mathrm{e}} \) is escape speed from the earth and \( \mathrm{V}_{\mathrm{p}} \) is that from \( \mathrm{a} \) planet of half the radius of earth, then
(a) \( \mathrm{V}_{\mathrm{e}}=\mathrm{V}_{\mathrm{p}} \)
(b) \( \mathrm{V}_{\mathrm{e}}=\frac{\mathrm{V}_{\mathrm{p}}}{2} \)
(c) \( \mathrm{V}_{\mathrm{e}}=2 \mathrm{~V}_{\mathrm{p}} \)
(d) \( V_{e}=\frac{V_{p}}{4} \)
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