Depends if you are accelerating or braking, the opposite actually happens to what you think.
Try it with a helium balloon in the car.
If you accelerate you would think that the balloon would go backwards, but it doesn't, it comes forwards.
Reason is that when you accelerate the air in the car is pushed to the rear and therefore is more dense at the back of the car than the front, so the balloon moves towards the less dense air.
The opposite happens when you brake, the balloon moves to the rear as the air collects in the front.
At constant velocity the ball would fall as if you were still as you are all moving as one unit, including the air in the car.
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