Summary

• Graphs of motion
• Freefall
• Vectors

• Written quiz    Timer
  
  
• Vectors
  • subtracting vectors
  • vector components
    Example #1
    
    Example #2
    
  • position, velocity, acceleration vectors
  
  
  
  

sj6 3.9
A plane flies 280 km at 20° north of east and then 190 km at 30° west of north. Now how far is it from its starting point?
A. 168 km
B. 190 km
C. 260 km
D. 310 km
Answer















sj6 3.10
Vector A has length 8 at 45° from the +x axis, and B has length 8 along the −x axis. What is A-B?
A. 14.8 at 22.5°
B. 16.0 at 22.5°
C. 6.12 at 112.5°
D. zero
Answer















 



D. 310 km





















 



A. 14.8 at 22.5°