Homework Help: Pre-Ap Physics

Posted by Maria on Monday, September 24, 2012 at 4:07pm.

To win the game, a place kicker must kick a
football from a point 17 m (18.5912 yd) from
the goal, and the ball must clear the crossbar,
which is 3.05 m high. When kicked, the ball
leaves the ground with a speed of 15 m/s at
an angle of 58.9
◦
from the horizontal.
The acceleration of gravity is 9.8 m/s
2
.
By how much vertical distance does the ball
clear the crossbar?
Answer in units of m

Pre-Ap Physics - bobpursley, Monday, September 24, 2012 at 4:22pm
1) figure the time in air from
horizontal distance=horizontalvelocity)time

now knowing the time, figure the final vertical height.

hf=ho+verticalinitialvelocity*time-4.9t^2

now subtract the bar height.

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