Homework Help: physics!

Posted by emily on Tuesday, December 9, 2008 at 9:49pm.

A place kicker must kick a football from a point 36 m from the goal, and the ball must clear the crossbar, which is 3.05m high. When kicked, the ball leaves the ground with a speed of 20.0m/s at an angle of 53 degrees 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?

how do i do thiss??? thanks:)

physics! - drwls, Tuesday, December 9, 2008 at 10:47pm
Calculate how long it takes for the ball to get to the goal post. Then calculate its vertical velocity component and elevation at that time. Compare the vertical position to 3.05 m to see if it cleared the bar. The sign of the vertical velocity component at that time will tell your the answer to b.

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