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H2Owned
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Homework Statement
a football kicker can give the ball an initial speed of 25m/s. what are the least and greatest elevation angles at which he can kick the ball to score a field goal from a point 50m in font of the goalposts whose horizontal bar is 3.44 m above the ground.
Homework Equations
d = Vit + 0.5at^2
The Attempt at a Solution
Dx=distance in x direction
Dy=distance in y direction
and so on for Velocity and Acceleration
V = 25m/s
Dy = 3.44m
Vx = 25cos(theta)m/s
Vy = 25sin(theta)m/2
Ay = -9.8m/s^2
t = (Dx)/(Vx) = 50m/(25cos(theta))s
Now plug everything into an equation for Dy
Dy = Vy*t + 0.5Ay*t^2
3.44 = (25sin(theta))(2/cos(theta)) + 0.5(-9.8)(2/cos(theta))^2
I cannot get an answer for theta out of this equation..
The proper answers are 31 degrees and 63 degrees but i dot know how to solve it