Rigidbody.drag

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public float drag;

Description

The drag of the object.

Drag can be used to slow down an object. The higher the drag the more the object slows down.

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour
{
    public Rigidbody rb;

    void Start()
    {
        rb = GetComponent<Rigidbody>();
    }

    void OpenParachute()
    {
        rb.drag = 20;
    }

    void Update()
    {
        if (Input.GetButton("Space"))
            OpenParachute();
    }
}