Answer:
+7 m/s
Explanation:
\(\Delta v\) (change in velocity) is defined as the difference between the final velocity and the initial velocity:
\(\Delta v = v_f -v_i\)
where:
\(v_f = 9 m/s\) is the final velocity
\(v_i = 2 m/s\) is the initial velocity
Substituting the numbers into the equation, we find
\(\Delta v = 9 m/s - 2 m/s = +7 m/s\)
So, the ball has increased its velocity by 7 m/s.
