A momentum, it measures the inertia of a moving object now how does it moves

Momentum is directly related to how an object moves because it incorporates the object's velocity. Velocity describes both the speed and direction of an object's motion. Therefore, an object's momentum tells us not only how much "oomph" it has (due to its mass and speed) but also the specific direction in which it is moving. A larger momentum means the object has more inertia in motion, making it harder to stop or change its direction.