Tranh slowed his skateboard as he
approached the street. He went from 8 m/s
to 2 m/s in a period of 3 seconds.
1. Is he accelerating or decelerating?
2. What is the value? (include units)

Explanation:

Given parameters:

Initial velocity  = 8m/s

Final velocity  = 2m/s

Time taken  = 3seconds

Unknown and solution:

1. Is he accelerating or decelerating?

Tranh is obviously decelerating in this period. This is negative form of acceleration in which the speed reduces as the body comes to a stop.

Deceleration is a negative change in velocity with time i.e a body is reducing its velocity as time is changing.

2. What is the value?

 Mathematically;

          Deceleration  =

         Deceleration  =

                                  = -2m/s²

i think the answer would be b