ScrollRect.decelerationRate

Description

The rate at which movement slows down.

The deceleration rate is the speed reduction per second. A value of 0.5 halves the speed each second. The default is 0.135. The deceleration rate is only used when inertia is enabled.

using UnityEngine;
using System.Collections;
using UnityEngine.UI; // Required when Using UI elements.

public class ExampleClass : MonoBehaviour
{
    public ScrollRect myScrollRect;

    public void Start()
    {
        // assigns a new value to the decelerationRate of the scroll rect.
        // The higher the number the longer it takes to decelerate.
        myScrollRect.decelerationRate = 5.0f;
    }
}