Question

Explain why your body feels like it's being pushed back when the car starts back up again.

Answer 1

That shows Newton's 3rd law of motion, (a.k.a. inertia). Your body wants to stay where it is when the car accelerates, and the car has to push on you to get you moving.So, being pushed forward, unless you're accelerating backward. R
REMEMBER: Inertia is the tendency for things at rest to stay at rest until an outside force acts upon it.
I hope this help you!!