Contribute correction: Physics I

  _  _      ___      _____    __   __  
 | \| ||   / _ \\   /  ___||  \ \\/ // 
 |  ' ||  | / \ || | // __     \ ` //  
 | .  ||  | \_/ || | \\_\ ||    | ||   
 |_|\_||   \___//   \____//     |_||   
 `-` -`    `---`     `---`      `-`'