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