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August 12th, 2011, 07:05 AM   #1
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Angry Bird

Question : (Refer the following image link) else there is no way to solve this question
http://a1.sphotos.ak.fbcdn.net/hphot..._5109935_n.jpg

In the polular game "Angry Birds" , in order to make sure the red bird can hit the green pig , what should be the launch angle (respect to horizontal) of the slingshot if the time of flight is 2.50s? (7m)

Can someone show me steps to do? Got people tell me use velocity formula , also got people ask me use vector formula...etc..can someone show me steps to obtain answer?
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August 12th, 2011, 08:34 AM   #2
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Re: Angry Bird

If we assume the projectile is at the origin at time t = 0, then parametrically, the motion will be given as:





From the diagram, we let g = 9.8 m/sē, t = 2.50 s, x(t) = 55 m and y(t) = 2 m:





Solving both for gives:



Multiply through by



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August 12th, 2011, 08:40 AM   #3
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Re: Angry Bird

what if you assume g = 10 m/s ?
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August 12th, 2011, 08:47 AM   #4
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Re: Angry Bird

Then we would have:

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