John Throws a Rock Down with Speed 14 M/s from the Top

question 4

Multiple Choice

John throws a rock down with speed 14 m/s from the top of a 30-m tower.If g = 9.8 m/s² and air resistance is negligible,what is the rock's speed just as it hits the ground?

• A)12 m/s
• B)28 m/s
• C)350 m/s
• D)784 m/s

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