Answer:
1.4 m/s
Explanation:
The final velocity of the ball can be found by using the following SUVAT equation:
[tex]v^2-u^2=2ad[/tex]
where
v is the final velocity
u is the initial velocity
a is the acceleration
d is the distance travelled
In this problem,
u = 4.0 m/s
d = 14 m
a = -0.50 m/s^2
Solving the equation for v,
[tex]v=\sqrt{u^2+2ad}=\sqrt{4^2+2(-0.50)(14)}=1.4 m/s[/tex]