First,
let’s define what a Newton (N) is: “The Newton (N) is defined as the amount of
force that, when acting on a 1 kg mass, produces an acceleration of 1 m/s/s
(one meter per second per second). Therefore, 1 N = 1 kg × 1 m/s/s.”
The
force of friction opposing the 325 N force is .25 *
925 N (which is equal to 231.25 N). The force pulling the crate is 325 N * cos(25),
i.e. 294.55 N. (This is the component of force acting parallel to the floor.)
Take
the difference between these two and you will have the net force pulling the
crate (which is 63.3 N). Using Newton's equation F = ma, you will find the
acceleration by dividing the net force by the mass of the crate (the mass is
925 N/(one standard gravity [9.80665 m/s/s], or 94.32
kg). The acceleration is therefore 63.3 N / 94.32 kg, which equals 0.671 m/s/s.