This question can be solved using the equations of motion.
The acceleration of the ball is "-44100 m/s²".
We can find out the acceleration of the ball by using the third equation of motion:
[tex]2as = v_f^2 - v_i^2\\[/tex]
where,
a = acceleration = ?
s = distance covered = 0.02 m
vf = final velocity = 0 m/s
vi = initial velocity = 42 m/s
Therefore,
2a(0.02 m) = (0 m/s)² - (42 m/s)²
a = -44100 m/s²
negative sign shows deceleration
Learn more about the equations of motion here:
brainly.com/question/20594939?referrer=searchResults
The attached picture shows the equations of motion.