an observer 70 meters south of a railroad crossing watches an eastbound train traveling at 60 m per sec. at how many meters per second is the train moving away from the observer 4 sec after it passes through the intersection
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Expert's answer
2012-04-13T07:21:42-0400
we have right-angled triangle with sides 70 m and 60*4=240 m. the speed is sqrt(70^2+240^2)/4=62,5 m/sec
Comments
Dear visitor! The mistake really took place! Thanks for correcting us
60*4=240, not 280...
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