Fake coins II

I still have fake coins... but now I have a more recent scales : an acurate one, able to give the exact weight of a set of coins. A good coin is 10g and a fake one 9g.
I know I have 2 fake coins im my heap of 5 coins.
How many weighings are required in worst case to find them ?

I have also 10 fake coins in my bag of 100 coins. How many weighing in worst case ?

Details (includes Java applet)


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