Question: A roller coaster starts from rest at its highest point and then descends on its (frictionless) track. Its speed is (30 mathrm{~m} / mathrm{s}) when

A roller coaster starts from rest at its highest point and then descends on its (frictionless) track. Its speed is $30 \mathrm{~m} / \mathrm{s}$ when it reaches ground level. What was its speed when its height was half that of its starting point?

A. $11 \mathrm{~m} / \mathrm{s}$

B. $15 \mathrm{~m} / \mathrm{s}$

C. $21 \mathrm{~m} / \mathrm{s}$

D. $25 \mathrm{~m} / \mathrm{s}$

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