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OpenStudy (anonymous):
A ball is rolled off the edge of a swimming pool and strikes the water 2.0 m away 0.30 second later. (a) What was the initial speed of the ball? (b) What is its speed when it struck the water?
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OpenStudy (anonymous):
You can use the first equation of motion, because you have h = 2m distance traveled t = .30 s a = gravity \[h = v_ot + \frac{1}{2} at^2\] How could you think how fast the ball was moving given the initial velocity, time, and acceleration?
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