I have been wondering how the classical mechanics that I study in my textbook today was framed. Newton gave his laws of motion, but what about vectors, who invented those. We deal with freely falling bodies and acceleration due to gravity while studing kinematics. But I know that the law of gravitation was developed by newton nearly 40 years after he framed these "laws" of mechanics. He didn't know the value of 'g', 'G', or anything else. How did he work? Somebody should point me to a proper link or book where I can clarify such useless, irrelevent doubts. Thank you.