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Period: Jan 1, 1100 to Jan 1, 1165
Hibat Allah Abu'l-Barakat al-Baghdaadi: Force and acceleration
He proposed that force is proportional to acceleration and not velocity -
Jan 1, 1121
Al-Khazini: Gravitational Potentiel Energy
Develops the concept of gravitational potentiel energy and the idea that gravity is a force acting at a distance