Answer:
d. moving at
![3.1 m/s^2](https://img.qammunity.org/2020/formulas/physics/middle-school/wcij5v6uobw851gti5sfai5hsgwrfdpqje.png)
Step-by-step explanation:
We can solve the problem by applying Newton's second law:
(1)
where
F is the net force on the object
m is the mass of the object
a is its acceleration
Here we are only interested in the motion of the object along the horizontal direction. There are two forces acting on the object in this direction:
- The force
, pushing to the right, with magnitude 8.4 N
- The force
, pulling to the left, with magnitude 2.2 N
So, we can rewrite (1) as
![F_A - F_f = ma](https://img.qammunity.org/2020/formulas/physics/middle-school/n6m9n9131sw9xfkj94sihx9bz6hnut6lmt.png)
Where:
![F_A = 8.4 N\\F_f = 2.2 N\\m = 2.0 kg](https://img.qammunity.org/2020/formulas/physics/middle-school/vdr10gfcj2kka8okznr36n70rrdhw8arx8.png)
And solving for a, we find the acceleration:
![a=(F_A-F_f)/(m)=(8.4-2.2)/(2.0)=3.1 m/s^2](https://img.qammunity.org/2020/formulas/physics/middle-school/ubgpm70qlzm7alt6lhsakp8qkoapfueygc.png)
and the direction is the same as the net force, so to the right.