Question

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)​

Answer 1

Step-by-step 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 =
`(Final velocity - initial velocity)/(time taken)`

Deceleration =
`(2 -8)/(3)`

= -2m/s²