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The acceleration of gravity is 9.8 meters (32.2 feet) per second2.

After 3 seconds, the speed of the falling rock is 29.4 meters (96.6 feet) per second.

The rock's average speed during the 3 seconds is 14.7 meters (48.3 feet) per second.

The distance it has fallen = (average speed) x (time) = 44.1 meters (144.9 feet).

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