Posted by **ksunhsine** on Sunday, October 5, 2008 at 9:11pm.

was wondering if someone can help me out. Question: a jet has a length of 59.7 meters. The runway on which the plane lands intersects another runway. The width of the intersection is 25m. the plane decelerates thru the intersection at a rate of 5.70 m/s^2 and clears it with a final speed of 45 m/s. how much time is needed for the lkplane to clear the intersection?

- college - physics -
**GK**, Friday, October 10, 2008 at 11:17am
v_{f}^{2} = v_{i}^{2} + 2ad

(45m/s)^{2} = v_{i}^{2} + 2(-5.7m/s^)(25m)

Solve for Vi

Find the average velocity = (v_{i}+v_{f})/2

Divide the width of the intersection by v_{avg}

- college - physics -
**GK**, Friday, October 10, 2008 at 11:29am
Oops, I did not take the length of the plane into account. My first solution shrank the plane to a point concentrated at the end of its tail. I think this can be fixed by changing the distance, d, from 25m to (25+59.7) m.

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