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September 18, 2014

September 18, 2014

Posted by **Shin** on Wednesday, June 26, 2013 at 9:23am.

- Math (Combinatorics) -
**lin**, Wednesday, June 26, 2013 at 9:56am16

- Math (Combinatorics) -
**lin**, Wednesday, June 26, 2013 at 9:56amTwo thin and identical steel rods move with equal speeds v=1 m/s in opposite directions and collide longitudinally.The collision is perfectly elastic and the rods swap their velocities. How long does the collision last in seconds if the length of the rods is l=30 cm. Assume that the speed of sound in the steel rods is c=5000 m/s?

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