Posted by **Lisa** on Tuesday, January 26, 2010 at 9:28pm.

a plane is flying due north at 155 mi/h and encounters a wind from the west at 45m/h. what is the plane's new velocity with respect to the ground in standard position.

answer is 128 mi/h at 239.4. how do i get to this answer.

- Physics -
**Lisa**, Tuesday, January 26, 2010 at 9:29pm
a plane is flying southwest at 155 mi/h and encounters a wind from the west at 45m/h. what is the plane's new velocity with respect to the ground in standard position.

answer is 128 mi/h at 239.4. how do i get to this answer.

- Physics -
**drwls**, Tuesday, January 26, 2010 at 9:39pm
I do not agree with that answer. You should add 155 N and 45 W as vectors.

I get a ground speed of 161.4 mph, with a direction 16.2 degrees West of North.

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