When camera switches, rigidbody.velocity doesn't work

Questions & Answers
1

I’m trying to create a scene in which when the player reaches near a boat and presses ‘f’ , main camera switches to boat camera to simulate a “you have entered the boat” , My boat also moves according to a,w,s,d keys but the problem is whenever I press f the camera switches but the movement of boat doesn’t take place.

Here is the script:

#pragma strict

var moveSpeedX:float=50;
var moveSpeedZ:float = 80;
private var player1:GameObject;
var desiredDistance:float =5;
@HideInInspector
static var boatCam:Camera;
@HideInInspector
static var mainCam:Camera;
private var guiOn:boolean;

function Awake() {

	player1 = GameObject.FindWithTag("MainCamera");
	boatCam = GameObject.FindWithTag("Boat Cam").camera;
	mainCam = GameObject.FindWithTag("MainCamera").camera;
	mainCam.active = true;
	boatCam.active = false;

}

function Update () {
//Distance Calculation
	var dist:float = Vector3.Distance(transform.position , player1.transform.position);
	if(dist<desiredDistance && Input.GetKeyDown(KeyCode.F))
	{
		//GUI On
		guiOn = true;
		
		//Camera Switching
		
		mainCam.active = false;
		boatCam.active = true;		
		

		// Movement

		var amtToMoveX = (moveSpeedX/rigidbody.mass)*Input.GetAxis("Horizontal");
		amtToMoveX*=Time.deltaTime;
		var amtToMoveZ = (moveSpeedZ/rigidbody.mass)*Input.GetAxis("Vertical");
		amtToMoveZ*=Time.deltaTime;

		rigidbody.velocity = Vector3(amtToMoveX,0,amtToMoveZ);


	}
	guiOn = false;
}
2

you applying movements just once, when F is pressed down. instead of this you should store current state like bool OnBoat; and set it to true once you are on boat. then in movement part check this state and apply movements to player or boat