Question

1. At the electromagnetics lab, your computer analyzes the track left behind by an electron in your lab. The computer analysis reveals that the xx-position of the electron is well approximated by the function
   
   x(t)=t3−8t2+12tx(t)=t3−8t2+12t
   
   for the time interval starting at 0 μμs and ending at 6 μμs. Note that the time variable in the formula is assumed to be in μμs and the distance unit is assumed to be a centimeter.
   
   10) At what times was the electron momentarily at rest? [Enter the earlier time in the first answer box and the later time in the second answer box].

   Answer 1 of 2:

   Answer 2 of 2:  Last Answer 1: 4.4305s Last Answer 2: 1.131s
   Not yet correct, tries 7/20

   Hint: You might want to plot the function to get a position-time graph. You could also use some basic calculus.
   
   11) What was the xx-component of the instantaneous velocity of the electron at time 2 μμs?

   Correct, computer gets: -8.000 cm/us

   Hint: When you are devising a plan for solving this problem, consider some calculus to help you solve this. Also, careful about the units!
   
   12) What was the average velocity of the electron during the time interval between the times it came to rest?

Answer 1