How to limit the speed of a rigidBody ?

Questions & Answers
1

Hi,I have checked several other question on this topic already and tried to copy some of the solutions but it doesn’t speed to be working.I can’t tell what i am doing wrong i have tried only adding force when the velocity.Magnitude is below maxspeed that doesn’t work and i have also tried subtracting force/adding force in oppisite direction like in the script below that doesn’t work either

using UnityEngine;
using System.Collections;

public class Wander : MonoBehaviour {

	Vector3 targetPosition,direction;
	Rigidbody2D rbSelf;
	public float changeDirectionTimer,timeBeforeDirectionChange,magnitude;
	public LayerMask mask;
	public float wanderSpeed,maxSpeed,wanderSpeedLerp;
	public bool usingRigidBody;

	void Start () 
	{
		targetPosition = transform.position + new Vector3 (Random.Range (-magnitude,magnitude),Random.Range (-magnitude,magnitude));
		rbSelf = GetComponent<Rigidbody2D>();
		direction = targetPosition - transform.position;
	}

	void FixedUpdate () 
	{
		if(usingRigidBody == true)
		{
			rbSelf.AddForce(direction* wanderSpeed);
		
			if(rbSelf.velocity.magnitude > maxSpeed)
			{
				rbSelf.AddForce(-direction * wanderSpeed * 2);
			}
		}

		if(usingRigidBody == false)
		{
			transform.position = Vector3.MoveTowards(transform.position,targetPosition,wanderSpeedLerp);
		}
		
		changeDirectionTimer++;

		if(Mathf.RoundToInt( transform.position.x ) == Mathf.RoundToInt( targetPosition.x))
		{
			if(Mathf.RoundToInt( transform.position.y ) == Mathf.RoundToInt( targetPosition.y))
			{
				ChangePoisition();
			}
		}
		
		if(changeDirectionTimer >= Random.Range( timeBeforeDirectionChange - 20 , timeBeforeDirectionChange+ 20))
		{
			ChangePoisition();
		}

		Vector3 rayDirection = targetPosition - transform.position;
		RaycastHit2D hit = Physics2D.Raycast (transform.position,rayDirection,Vector3.Distance(transform.position,targetPosition) + 0.1f,mask);
		Debug.DrawRay(transform.position ,rayDirection ,Color.blue);
		Debug.Log (hit.collider.tag);


		if(hit.collider.tag == "Walls")
		{
			ChangePoisition ();
		}
	}

	void ChangePoisition()
	{
		targetPosition = transform.position + new Vector3 (Random.Range (-magnitude,magnitude),Random.Range (-magnitude,magnitude));
		changeDirectionTimer=0;
		direction = targetPosition - transform.position;
	}

	void OnCollisionStay2D()
	{
		ChangePoisition ();
	}
}
2

An easy solution would be:

FixedUpdate(){
   rigidbody.velocity = Vector3.ClampMagnitude(rigidbody.velocity, maxVelocity);
}