Answer:
F = 7.7 [N]
a = 2.2 [m/s²]
Explanation:
In the attached picture we see the forces on the wooden block, the total force is obtained by means of the sum of the pushforce and the friction force.
[tex]F_{total}=12.5-4.8\\F_{total}=7.7[N][/tex]
Now we must apply Newton's second law, which tells us that the total force on the body must be equal to the product of mass by acceleration.
[tex]F=m*a[/tex]
[tex]7.7=3.5*a\\a=2.2[m/s^{2} ][/tex]
