Two horizontal forces `vec(F)_(1)` and `vec(F)_(2)` act on a 4.0 kg disk that slides over frictionless ice, on which an xy coordinate system over frictionless ice, on which an xy coordinate system is laid out. Force `vec(F)_(1)` is in the positive direction of the x axis and has a magnitude of 7.0 N. Force `vec(F)_(2)` has a magnitude of 9.0 N. Figure 5-39 gives the x component `v_(x)` of the velocity of the disk as a function of time t during the sliding. What is the angle between the constant directions of forces `vec(F)_(1)` and `vec(F)_(2)` ?

Explanation

`56^(@)`