Physics Review Question Unit: Mechanics Year: 1994 Question#: 6 Question: A rock falls freely from rest near the surface of a planet where the acceleration due to gravity is 4.0 meters per second2. What is the speed of this rock after it falls 32 meters? (1 ) 8.0 m/s (2 ) 16 m/s (3 ) 25 m/s (4 ) 32 m/s What is this question really asking? Explanation by: Maria K [ Return to question menu ] Answer 1 8.0 m/s INCORRECT given: v intial = 0m/s a = 4.0 m/s2 s = 32 m find : v final try using  return to top Answer 2 16 m/s CORRECT given: v intial = 0m/s a = 4.0 m/s2 s = 32 m find : v final you used  correctly. return to top Answer 3 25 m/s INCORRECT given: v intial = 0m/s a = 4.0 m/s2 s = 32 m find : v final try using  return to top Answer 4 32 m/s INCORRECT given: v intial = 0m/s a = 4.0 m/s2 s = 32 m find : v final try using  return to top What's this question really asking? What's the final velocity of the rock? return to top
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