It is zero units
Fnet  = Fn + Fg
        = 10 units + (-10 units)
        = 0 units
it is called balanced force
2 4 2
thank you! but your answer is wrong :)
my answer is wrong when the boy and the girl was pulling the crate with the same direction......
yEs! Your answer is wrong :))
you didn't say that they are pulling in the same direction -_-