ANSWER:
100 N
STEP-BY-STEP EXPLANATION:
By means of Newton's second law we can calculate the force:
[tex]\begin{gathered} F=m\cdot a \\ m\text{ = mass} \\ a\text{ = acceleration} \\ a=\frac{\Delta v}{t} \\ \text{ replacing } \\ a=\frac{0-10_{}}{1}=-10m/s^2 \end{gathered}[/tex]Knowing the acceleration and the mass, we can plug in to calculate the force, just like this:
[tex]\begin{gathered} F=10\text{ kg }\cdot-\text{ }10m/s^2 \\ F=-100\text{ N} \end{gathered}[/tex]The mattress exerts 100 N to stop the ball.
