How to access this in my view

I am new with this laravel , I am using resource.

namespace App\Http\Controllers;

use Illuminate\Http\Request;

use App\Cars;
use App\Http\Requests;
use App\Http\Controllers\Controller;


class BookController extends Controller
{
       public function show($id)
    {
        $car = Cars::where('car_id',$id);
        return view('book.view',compact('car'));
    }
}

Here is my route.php

  Route::resource('book','BookController');

Here is my view.blade.php

     {{ $car->car_id }}

but it gives me error Undefined property: Illuminate\Database\Eloquent\Builder::$car_id

How can I display the car_id ?

Thank you in advance.

via Chebli Mohamed