Questions asked by Apeach

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• What is the force on a 1000 kg elevator that is falling freely at 9.8 m/sec2? And How do I draw a Free Body Diagram of this?
  
• Free-Body Diagram?
  
• Why motion happens?
  
• How the foods that Ancient Romans ate showed that their Empire was powerful?
  
• 1. Is chemical reaction and chemical change same? 2. Is physical reaction and physical change same?