Answer: The mass of an ball is 2.08 kg.
Step-by-step explanation:
Force is defined as the push or pull on an object with some mass that causes change in its velocity.
It is also defined as the mass multiplied by the acceleration of the object.
Mathematically,

where,
F = force exerted on the ball = 13.5 N
m = mass of the ball = ?
a = acceleration of the ball =

Putting values in above equation, we get:

Hence, the mass of an object is 2.08 kg