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Homework Statement
A placekicker must kick a football from a point 36.0 m (about 40 yards) from the goal, and half the crowd hopes the ball will clear the crossbar, which is 3.05 m high. When kicked, the ball leaves the ground with a speed of 20.0 m/s at an angle of 48.0° to the horizontal.
(a) By how much does the ball clear or fall short of clearing or fall short of clearing the crossbar? (Enter a negative answer if it falls short.)
Homework Equations
Possibly:
vxi = vi cos theta
vyi = vi sin theta
change(y) = viy(t) + .5(a)(t)^2
The Attempt at a Solution
20 sin 48(t) - 4.9(t)^2
= 26.75-4.9(1.8)^2
change(y) = 26.75 - 15.88 =10.87
10.87-3.05 = 7.82 m. Which is the wrong answer.
Can someone please help. Thanks