To find the force that the floor exerts on the tennis ball, we can use Newton's second law of motion, which states that \( F = m \cdot a \), where \( F \) is the force, \( m \) is the mass of the object, and \( a \) is the acceleration.
Given:
- Mass of the tennis ball, \( m = 0.1 \) kg
- Acceleration, \( a = 10 \) m/s²
Now, we can calculate the force:
\[ F = m \cdot a = 0.1 , \text{kg} \times 10 , \text{m/s}^2 = 1 , \text{N} \]
Thus, the force exerted by the floor on the ball is 1 N.
So, the correct response is 1 N.