Hello!
The velocity function is:
[tex]\mathsf{V = V_0 + at}\\ \\ \mathsf{V = 8.6 +3.3t}[/tex]
a) 2.3 s earlier, we can make t = -2.3 s, in relation to our initial time:
[tex]\mathsf{V = 8.6 + 3.3\cdot(-2.3)}\\ \\ \mathsf{V = 8.8-7.59}\\ \\ \boxed{\mathsf{V = 1.21 \ m/s}}[/tex]
b) Now we can make t = 2.3 s:
[tex]\mathsf{V = 8.6 + 3.3\cdot2.3}\\ \\ \mathsf{V = 8.6 + 7.59}\\ \\ \boxed{\mathsf{V = 15.59 \ m/s}}[/tex]
