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April 21, 2014

April 21, 2014

Posted by **Chanel** on Friday, October 12, 2012 at 4:15pm.

A. How long does the ball take to reach the goal post? (5 points)

B. What is the ball’s speed when it reaches the goal post? (5 points)

C. By how much is the ball above or below the crossbar when it reaches the plane of the goal post? (5 points)

- Physics -
**Steve**, Friday, October 12, 2012 at 4:29pmin the x-direction,

vx = 22*cos52º = 13.5m/s

it travels 36m in 36/13.54 = 2.66 seconds

neglecting air resistance

vy = 22*sin52º - 9.8t = 17.34 - 9.8*2.66 = -8.73

vx is still 13.54

use pythagorean theorem to add the vectors

y = 0 + 17.34t - 4.9t^2 = 17.34*2.66 - 4.9*2.66^2 = 11.45

so, it clears the bar

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