By definition of Newton's second law we have to:
[tex] F = ma
[/tex]
Where,
F: Applied force
m: mass of the object
a: acceleration of the object
Clearing the mass we have:
[tex] m = \frac{F}{a}
[/tex]
Substituting values we have:
[tex] m = \frac{0.75}{3}
m = 0.25 Kg
[/tex]
Answer:
The mass of the ball is:
[tex] m = 0.25 Kg [/tex]