A projectile is shot upward from the surface of Earth with an initial velocity of...

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A projectile is shot upward from the surface of Earth with an initial velocity of 123 meters per second. Use the position function below for free-falling objects. What is its velocity after 3 seconds? After 15 seconds? (Round your answers to one decimal place.)s(t) =-4.9t + vot + 503 s15 s

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