If Frankie the kangaroo climbed out of the crate and pushed the crate with a mighty 12 newtons of force against the efforts of Fred and the man (each applying 10 newtons of force), what would be the net force on the crate from all the pushing?

That depends upon whatever force "Fred" is applying. You seem to have omitted part of the problem.

If Frankie the kangaroo climbed out of the crate and pushed the crate with a mighty 12 newtons of force against the efforts of Fred and the man (each applying 10 newtons of force), what would be the net force on the crate from all the pushing?

To calculate the net force on the crate, we need to consider the individual forces acting on it and then find their sum. In this case, we have:

1. Frankie the kangaroo: 12 newtons (force pushing against the crate)
2. Fred: 10 newtons (force pushing against the crate)
3. The man: 10 newtons (force pushing against the crate)

To find the net force, we simply add up all the forces:

Net force = Frankie's force + Fred's force + The man's force

Net force = 12 newtons + 10 newtons + 10 newtons

Net force = 32 newtons

Therefore, the net force acting on the crate from all the pushing is 32 newtons.