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?

✔ First calculating the speed :

V = d(in m)/t(in 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

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle