Posted by **Jon** on Friday, October 1, 2010 at 4:49pm.

An airplane has a velocity of 454 km/h relative to the moving air. At the same time, a wind blows northward with a speed of 99 km/h relative to earth. The airplane is moving in an easterly direction relative to earth. Find the speed of the airplane to relative to earth.

So, i used pythagorean theorem so square root of 454 squared plus the square root of 99 squared.. and i didn't get the right answer. Can someone explain this problem to me please?

- Physics -
**bobpursley**, Friday, October 1, 2010 at 5:30pm
speed=sqrt(454^2+99^2)

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