Hello!
The velocity function is:

a) 2.3 s earlier, we can make
t = -2.3 s, in relation to our initial time:

b) Now we can make
t = 2.3 s:
Answer:
12N to the right.
Explanation:
There is a force of 12N upwards and a force of 12N downwards: these cancel out.
Assign a negative value to forces towards the left, and a positive value to the forces towards the right: -3N and +15N
Combine them: -3N+15N = 12N
The net force has a magnitude of 12N, and since our answer was positive, it acts towards the right.