GetComponent<Rigidbody>().AddForce(Vector3.up * 5, ForceMode.VelocityChange); code example

Example 1: rb.addforce c#

rb.AddForce(0, 0, 5 * Time.deltaTime);

// Time.deltaTime is optional ( Make sure that "T" is caps)

Example 2: rb.addforce 3d c#

rb.AddForce(0, 0, 5 * time.deltaTime);

// time.deltaTime is optional