ch04-p102 - 102 We assume the balls initial velocity is...

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102. We assume the ball’s initial velocity is perpendicular to the plane of the net. We choose coordinates so that ( x 0 , y 0 ) = (0, 3.0) m, and v x > 0 (note that v 0 y = 0). (a) To (barely) clear the net, we have () 22 2 00 11 2.24 m 3.0 m 0 9.8 m/s y y yv t g t t −= ¡ which gives t = 0.39 s for the time it is passing over the net. This is plugged into the x - equation to yield the (minimum) initial velocity
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