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An object is dropped from the top of a cliff 625 meters high. Its height above the ground t seconds after it is dropped is

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An object is dropped from the top of a cliff 625 meters high. Its height above the ground t seconds after it is dropped is 625 - 4.9t. Determine its speed 10 seconds after it is dropped. The speed of the object 10 seconds after it is dropped is m/sec. (Simplify your answer.)

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