Understanding the Concepts

* Newton's Second Law: The net force acting on an object is equal to its mass times its acceleration (F = ma).

* Acceleration: Acceleration is the rate of change of velocity (a = Δv/Δt).

Solving the Problem

1. Calculate the acceleration:

* F = ma

* 9.0 N = (6.0 kg) * a

* a = 1.5 m/s²

2. Calculate the change in velocity:

* a = Δv/Δt

* 1.5 m/s² = Δv / 2.0 s

* Δv = 3.0 m/s

Answer: The change in velocity of the object is 3.0 m/s.