Homework Statement
An object changes its velocity from 10 m/s [W] to 20 m/s [W] in 4.0s.
An object changes its velocity from 20 m/s [W] to 10 m/s [W] in 4.0s.
Homework Equations
N/A
The Attempt at a Solution
I'm thinking the first one is positive acceleration and the other one is negative...