Physics help please

  • Thread starter Eash
  • Start date
  • #1
2
0

Homework Statement



A soccer ball is kicked at 25 m/s at an angle of 22 degrees . The ball hits the crossbar 2.5 m off the ground. Where was it kicked from?

Homework Equations



d = ViT + .5* a * T^2

The Attempt at a Solution



I have no clue
 

Answers and Replies

  • #2
fss
1,179
0
Resolve the velocity vector into components and work backwards from 2.5m in the y-direction.
 
  • #3
So the soccer ball hits the crossbar (assuming it hits at 2.5 meters high). What does that mean? Do what fss said and break the motion into components, x and y. 2.5 is the positive y displacement. So we have 2.5 = vy (t) + 1/2a(t^2). So what is vy? and what is a? If you have a question about that, add a reply. So you should solve for t, using the quadratic formula. Then, in the x direction, you have distance (in the x-direction of course) = vx (t). So once you get t, you can plug in so you find the distance it traveled in the x-direction.
 

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