How long will it take the ball to reach a speed of 24.5m/s dropped from a cliff and has an acceleration of 9.8m/s2?
Acceleration = increase in speed / time, a = ( Vf - Vi ) / t. Therefore 9.8 = (24.5) / t, 9.8t = 24.5. Answer t = 2.5s. ChaCha.
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