When you are wearing a seat belt and need to stop suddenly, your body tries to move forward as the car slows down. you feel the seat belt back on your body as you move forward into it. which of newtons motion laws best explains why this happens

First Law

Explanation:

When you are sitting in the moving car, you are ina moving system, but when the car stops,  your body (that is inside the car) does not stop with it, this is because the first law, that says that an object will remain still or in constant motion until a force is applied over it.

This is why your body will continue with constant velocity after the car stops, and the seat belt keeps you in place as if you are another piece of the car that also stops with it.

answer: good job it's all correct !

explanation:

b. lifting dumbbell weight at 20-degree angle from the body after a 45-degree angle