a ball is dropped and falls freely. What is the reaction to the force of gravity pulling the ball down?
These are physics problems...
I'll help you, but next time, post math problems. Do you know what the gravity of earth is?
9.8
Are you speaking of reaction when ball hits a surface?
yes
When a ball hits a surface, it turns into kinetic energy if not elastic. However, if the ball is elastic, the ball will rebound. So, when the ball hits the surface, a huge force is created which is called an impact. .. http://www.engineeringtoolbox.com/impact-force-d_1780.html
The impact is great due to the total potential energy of the free fall mgh but divided by the slow down distance. F=mgh/s. I am not sure what you learned so far in class in order to help answer you correctly.
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