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 faster than on Earth.
C) the same speed as on Earth.
D) the square root of three times slower than on Earth.
E) three times slower than on Earth.

Question

Quizplus · Accepted Answer

The final speed of an object in free fall is directly proportional to the acceleration due to gravity. Since Mars' gravity is about one-third of Earth's, the final speed on Mars would be three times slower than on Earth for the same fall time.

The Acceleration Due to Gravity near the Surface of Mars