What is the acceleration of a 30-kg object that is traveling at vi = 15 m/s and slows to
Ve= 5 m/s in 8 seconds?

-1.25m/s²

Explanation:

Given parameters:

Mass of object  = 30kg

Initial velocity  = 15m/s

Final velocity  = 5m/s

Time  = 8s

Unknown:

Acceleration of the object  = ?

Solution:

Acceleration is the rate of change of velocity with time.

  Acceleration =  

V is the final velocity

U is the initial velocity

t is the time taken

To solve this problem, insert the parameters:

   Acceleration  =   = -1.25m/s²

This shows that the object is decelerating.

the total distance traveled by the car is

30km + 49km = 79 km .