got char stuck near objects.

i am trying to make this character hit some boxes but when he hits, the boxes can push him over or backwards

var speed : float; var speedincrease : float; var massa : float; private var motor : CharacterMotor; var posy : float; function Start () { posy = transform.rotation.y;} function Awake () { motor = GetComponent(CharacterMotor);} function Update () { motor.inputJump = Input.GetButton("Jump"); transform.position.x = transform.position.x+Time.deltaTime*(speed-massa); transform.position.z = 0; transform.rotation.y = posy;}