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posted by  jbaili on 11/6/2009 5:32:10 PM  |  status: Closed  |  Earned Karma: 25

14.10 w9

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14.10 If there were no air resistance, how fast would you have to throw a football at an initial 45° angle in order to complete an 80 meter pass? show your work

m/s
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posted by Justin_08 on 11/6/2009 5:36:45 PM  |  status: Live
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       Given that the horizontal distance is R = 80 m
       angle is = 45o
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 Horizontal distance covered by the projectile with initial velocity u is 
                   R = u2 sin2θ / g 
             80 m =  u2 sin90o /  ( 9.8m/s2 )
                  u = 28 m/s
 
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