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quote:Originally posted by chrisThe wheel changes velocity because it accelerates in the opposite direction to that in which it was initially travelling.This means that it will slow down, instantaneously have zero velocity, and then increase in velocity in the opposite direction.The same can be said for a ball thrown into the air. As it ascends it is being 'acclerated' downwards again by gravity, so it slows down at the rate of 10 m/s/s. It will therefore reach a point where it stops moving for an instant, before falling back to earth. But again, this is only an instant in time. Imagine cutting a cake into smaller and smaller wedges - the cake wedges are the speed of the ball - this is what the ball is doing as it approaches its maximum height above the ground.Chris"I never forget a face, but in your case I'll make an exception" - Groucho Marx
quote:Originally posted by David SparkmanIm still looking for a quantium physics level explaination of reflection of light.David