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Old Nov 16th 2015, 04:16 PM   #1
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Kinematics in 2 dimensions question

A football is placed 25 meters away from the field goal pole. The quicker kicks the football directly between the two goal poles with the vector speed of 21.0 m/s [47, o degree above the horizontal). The horizontal bar of the goal poles is 3.00 m above the ground. What is the distance below and above the bar once the football is kicked.

*This question had to be translated from a French physics course. I hope that I translated the question clearly enough. If not, please don't hesitate to email me at dillonseguin@live.ca for any clarifications. I would appreciate any help at this point.


Last edited by dillonseguin; Nov 17th 2015 at 04:13 AM. Reason: Need to add picture of attempted work
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Old Nov 17th 2015, 09:19 AM   #2
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Suggested approach:

1. Calculate the initial horizontal and vertical components of velocity.
2. Calculate the time it takes for the football to reach the goal posts, from horizontal distance of 25 meters divided by horizontal velocity. Call this T.
3. Calculate the vertical height of the ball at time T, using basic equation of motion and initial vertical velocity v_0: y(T) = y_0 + v_0T + (1/2) aT^2, where a = -9.8 m/s^2.
4. Calculate the difference between y(T) and the 3 meter height of the crossbar.

Post back with what you get for an answer and we'll check it for you.
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