Answer
The magnitude of the net force acting on the ball is $133.5N$
Work Step by Step
1) Find the acceleration $a$ of the ball
Initial velocity $v_0=0$, final speed $v=45m/s$, duration $x=44cm=0.44m$
$$v^2=v_0^2+2ax$$ $$a=\frac{v^2}{2x}=2301m/s^2$$
2) The ball has mass $m=58g=0.058kg$. The net force that acts on the ball is $$\sum F=m_{ball}a=133.5N$$
