Two pulses traveling toward each other at 1 cm/s: shape after 5 seconds

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1. Two pulses are traveling towards each other at 1 cm/s on a long string at t = 0 s, as shown below.
,after t=5s and velcoity=1cm/s what would be the shape of the pulses:


http://img21.imageshack.us/img21/7654/homeworkk.png
 
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Where will the leading edge of each pulse be after 5 s? Draw a picture of each pulse and, where they overlap, stack them up like boxes. That's superposition.
 
so this means number second one?
i drew both pulses and stacked the overlaping and left the others alone.
 
Thanks a lot for your help.:smile: