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Rattle Bag

Motion querey

A truck is travelling towards me at ..say..50kmph. I throw a stone at it, it hits the truck and bounces off back towards me. The stone's speed has gone from a positive to a negative value, passing...
14:28 Fri 28th Jan 20051 answer, last by Rev. Green 19:34 Wed 04th Aug 2010

Only 1 question