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MIT 8.01 Physics I Classical Mechanics, Fall 1999 18 Online
OpenStudy (anonymous):

reason gravity

OpenStudy (yash2651995):

existence of mass.

OpenStudy (anonymous):

not yet discovered!!!..reseach is going but resently higgs boson (which defines mass) is discovered,so it may solve the mistry!! but according to some scientists its due to mass ,some says its due to particles and so on.....but we actually know nothing about gravity!!

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