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Projectile Motion question

  • Thread starter Strik3r
  • Start date
  • #1
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Homework Statement


Well to sum up the question: a football kicker kicks a ball with 20m/s initial velocity with a 53 degree angle. the goal post is 36m away and is 3.05m tall. does the ball pass the goal post? does the ball approach the crossbar while still rising or falling?

range=36m
acceleration= -9.8 m/s/s
V initial = 20m/s
angle theta= 53 degrees
height of post=3.05m

Homework Equations


range= (velocity initial x) multiply (time)
vix (velocity initial x) = vi cos angle theta
viy (velocity initial y) = vi sin angle theta

y=(viy) multiply (time) + 0.5at^2

The Attempt at a Solution



using the above information i found the that the ball crosses the goal post by 0.85meters.

here the problem. i dont know how to do the second part. any and all help will be appreciated thx.
 

Answers and Replies

  • #2
hage567
Homework Helper
1,509
2
You could find out at what range the maximum height occurs. Is this before or after the goal post?
 

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