How do I set up these problems?

  • Thread starter LocalYocal
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  • #1

Homework Statement



In a football game a ball is punted from an initial height of 0.75 m and at an angle of 41° above the horizontal. If the ball travels a horizontal distance of 38 yd before hitting the ground, what was its initial speed? (Neglect air resistance.)


Homework Equations



I cannot find any information in my text book relating to problems that have and starting point (y) that is not 0. What formula do I use on these problems? Thanks

The Attempt at a Solution

 

Answers and Replies

  • #2
rock.freak667
Homework Helper
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y=y0+v0t -1/2 gt2


use this where y0 is the initial height.

EDIT: this may help as well

v2=u2-2g(y-y0)
 

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