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Homework Statement
A soccer ball is kicked from the ground at an angle theta above the horizontal. Show that the equation h = 0.25R tan theta represents the maximum height of the ball, where h is the height and R is the range.
Homework Equations
t= dx/V1x
dy = v1y(t) + .5a(t)^2
The Attempt at a Solution
Vert - dy = 0, V1 = vsintheta, a = g, t=?
Horizontal - dx = R, V1 = vcostheta, t=R/vcostheta
dy = v1y(t) + .5a(t)^2
0 = vsintheta(R)/vCostheta + 1/2g(R/vcostheta)^2
sintheta(R)/Costheta = -1/2g(R/vcostheta)^2
Help please