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December 18, 2014

December 18, 2014

Posted by **Laura** on Wednesday, August 17, 2011 at 9:27pm.

(a) How far does the train on the left travel before the front ends of the trains pass?

(b) If the trains are each 150 m in length, how long after the start are they completely past one another, assuming their accelerations are constant?

- physics -
**bobpursley**, Wednesday, August 17, 2011 at 9:48pmThe distance covered is 50 m, so let the rightmost train go x meters, the left goes 50-x m in the same time...

x=1/2 aright*time^2

50-x=1/2 aleft*time^2

divide the equations

x/(50-x)=aright/aleft

solve for x (right), and 50-x (left)

b. now, the distance apart the ends starts at 350m.

one goes y, the other 350-y

solve it again, only this part find the time.

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