Answer:
[tex]a = \frac{20}{3} \frac{m}{s {}^{2} } [/tex]
Explanation:
The formula for velocity is:
[tex]v = vo - a \times t[/tex]
Where
[tex]vo[/tex]
is the ball's initial velocity.
solving for a:
[tex]40 = 20 + a \times t \\ 20 = a \times t \\ 20 = 3a \\ a = \frac{20}{3} [/tex]
