The acceleration due to gravity near the surface of Mars is about one-third of the value near the Earth's surface. If a rock fell from rest for the same amount of time on Mars and Earth, the final speed of the rock would be
A. three times faster than on Earth.
B. the square root of three times slower than on Earth.
C. the square root of three times faster than on Earth.
D. three times slower than on Earth.
E. the same speed as on Earth.
Answer: D
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