Arunner starts slowing down as she gets tired. at 10 seconds, she 8m/a, and slows down to 2m/a at 13 seconds. what is her acceleration.

Magnitude of acceleration = (change in speed) / (time for the change) .

Change in speed = (end speed) - (start speed)
                            =        (2 m/a)  -  (8 m/a)  =  -6 m/a .

Time for the change = (end time) - (start time)
                                 =   (13 sec)  -  (10 sec)  =  3 sec .

Magnitude of acceleration =  (-6 m/a) / (3 sec)

                                          =       -2 m/a per second .
 
(That's the best I can do with the ambiguous units.
What unit of speed is 'm/a' ?  Is that "miles per afternoon" ?)

Answer:

the word that best describes martin luther king jr.'s tone in the video is dignified

explanation:

martin luther king, jr. was a social activist and baptist minister who played a key role in the american civil rights movement from the mid-1950s until his assassination in 1968. the video shows his manner and attitude having or showing a composed or serious manner that is worthy of respect so dignified is the correct answer