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Physics 21 Online
OpenStudy (souvik):

Q

OpenStudy (souvik):

OpenStudy (souvik):

the correct answer is ticked in green..but i did not get the reason..:(

OpenStudy (souvik):

@Vincent-Lyon.Fr @Michele_Laino @IrishBoy123

OpenStudy (michele_laino):

I'm sorry, I don't know this answer

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