2.1) Displacement 

  Δx = xf - xi


  
  
2.2) Average Velocity
                  _
 v bar or average v = Δx / Δt = (xf - xi) / (tf - ti)

2.3) Instantaneous Velocity

  v = lim     Δx / Δt
      Δt -> 0 


  
2.4) Acceleration
                  _
 average a bar or a = Δv / Δt = (vf - vi) / (tf - ti)

 Instantaneous acceleration
 
 a = lim     Δv / Δt
     Δt -> 0 


  
2.5) Motion Diagrams

  
  
  
2.6) One dimensional motion with constant acceleration

  v = v0 + a t         (for constant a)
  _ 
  v = (v0 + v) / 2     (for constant a)
  
  x = v0t + 1/2 a t2   (for constant a)
  
  v2 = v02 + 2 a x     (for constant a)
          
	 
	 
2.7) Free Falling objects

  The force of gravity at sea level on Earth,
  
       g = 9.80 m/s2





Homework 2:
pp. 44 q. 1; pp. 45 q. 5, 1
pp. 46 q. 3, 8; pp. 47 q. 18, 19
pp. 48 q. 26, 34; pp. 49 q. 38, 39