To find the mass of the object, we can use Newton's second law of motion, which states that \( F = m \cdot a \), where \( F \) is the force applied, \( m \) is the mass, and \( a \) is the acceleration.
We can rearrange this equation to solve for mass:
\[ m = \frac{F}{a} \]
Given that:
- \( F = 20 \) N (newtons)
- \( a = 5 \) m/s² (meters per second squared)
Now, substituting the values into the equation:
\[ m = \frac{20 , \text{N}}{5 , \text{m/s}^2} = 4 , \text{kg} \]
Therefore, the mass of the object is 4 kg.