Pusher.cs

using UnityEngine;

[RequireComponent(typeof(Collider))]
[AddComponentMenu("Liberi/Pusher")]
public class Pusher : MonoBehaviour
{
    public Vector3 PushDirection = Vector3.up;
    public float PushAcceleration = 1f;

    void OnTriggerStay(Collider other)
    {
        if (!Sync.IsLocal(this))
            return;

        if (other.rigidbody != null && !other.rigidbody.isKinematic)
            other.rigidbody.velocity += PushDirection * PushAcceleration * Time.deltaTime;
    }
}