Q23: A placekicker must kick a football from a point m (about 40 yards) from the goal. Half the crowd hopes the ball will clear the crossbar, which is m high. When kicked, the ball leaves the ground with a speed of m/s at an angle of to the horizontal.
(a) By how much does the ball clear or fall short of clearing the crossbar?
(b) Does the ball approach the crossbar while still rising or while falling?