## baseball

An autographed baseball rolls off a 1.2m high desk & strikes the floor 0.37m away from the desk. The acceleration of gravity is 9.81m/s^2. How fast was it rolling on the desk before it fell off?
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 Recognitions: Gold Member Analyze the problem vertically using the equation $d=v_it+\frac{1}{2}at^2$ since vi is zero, solving for time yields: $d=\frac{1}{2}at^2 \implies t=\sqrt{\frac{2d}{a}}$ Now, use this time to analyze the problem horizontally. It moved a total distance d in time t, so use the equation $v_i=\frac{d}{t}$ and this will yield the balls initial horizontal velocity.

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