Angular velocity

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


A projectile is launched at 36 m/s and travels 100 m horizontally. If it is to be able to just barely clear a 10 m wall, between what two angles should the projectile be launched with respect to the horizontal?




Homework Equations


vf=vo+at
x=vot+1/2at^2
vf^2=Vo^2+2ax
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
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Welcome to PF!

Hi trigunesq! Welcome to PF! :smile:

(have a theta: θ and try using the X2 and X2 tags just above the Reply box :wink:)

They're asking you for the two angles from which it will be 10m up when it's 100m along.

Call the launch angle θ, and the time taken t, then use your constant acceleration equations for the x and y directions separately (a = 0 for the direction, of course), to get a pair of equations from which you can eliminate t to get a quadratic equation for θ (with two solutions! :wink:).

What do you get? :smile:
 

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