In Canadian football, after a touchdownthe team has the opportunity to earn one more point by kicking the ballover the bar between the goal posts. The bar is 10.0 ft above the ground,and the ball is kicked from ground level, 36.0 ft horizontally from the bar. Football regulations are stated in English units, but convertthem to SI units for this problem. (a) There is a minimum angle above theground such that if the ball is launched below this angle, it can never clearthe bar, no matter how fast it is kicked. What is this angle? (b) If the ball iskicked at 45.0° above the horizontal, what must its initial speed be if itis just to clear the bar? Express your answer in m/s and in km/h.
In Canadian football, after a touchdown
the team has the opportunity to earn one more point by kicking the ball
over the bar between the goal posts. The bar is 10.0 ft above the ground,
and the ball is kicked from ground level, 36.0 ft horizontally from the bar
. Football regulations are stated in English units, but convert
them to SI units for this problem. (a) There is a minimum angle above the
ground such that if the ball is launched below this angle, it can never clear
the bar, no matter how fast it is kicked. What is this angle? (b) If the ball is
kicked at 45.0° above the horizontal, what must its initial speed be if it
is just to clear the bar? Express your answer in m/s and in km/h.
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