Question

A sports car moving at constant velocity travels 120m in 5.0s. If it then brakes and comes to a stop in 4.0s,what is the magnitude of it's acceleration? ​

Answer 1

QUESTION①):

✔ First calculating the speed :

V = d(in m)/t(in s)

• V = 120/5
• V = 24 m/s

✔ You now know the average car's speed, is time it takes to stop it completely, so you can calculate its acceleration :

a = V/t

• a = -24/4
• a = 6 m/s²

The car has an acceleration of 6 m/s².