Question

What property of matter will keep your body in motion when the car comes to halt

Answer 1

That's not supposed to happen. When the car comes to a halt, so will your body if you were sitting in the car.

Answer 2

Inertia in our body tends to be in the situation it is. So, we a car comes to a halt, our body wants to keep moving i.e. in motion. hope that helps love!