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Initial Velocity: Kinemetic Equations | When is 0 m/s OK?
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[QUOTE="jfizzix, post: 4506198, member: 190322"] [itex]\vec{}[/itex]If you are concerned with the point the football has left the kicker's foot, it will have a nonzero velocity. If it did not, then it would stay on the ground where it was. The problem gives you the additional information that the ball is in flight for 3.8 seconds. You can use this information in your kinematic equation for the vertical component of position: [itex]y_{f} = y_{i} + v_{0y}t - \frac{1}{2}g t^{2}[/itex] Given that the initial and final height are both zero, [itex]0= v_{0y}t - \frac{1}{2}g t^{2}[/itex] and you can plug in the time of flight (3.8s) to find the vertical component of the initial velocity [itex]v_{0y}[/itex]. Hope this helps:) [/QUOTE]
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Initial Velocity: Kinemetic Equations | When is 0 m/s OK?
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