When a car suddenly stops at a red light, a book lying on the car seat will continue to move forward because: d. The book's inertia causes it to continue moving.
Inertia can be defined as the tendency of an object such as a book to continue in its state of motion or remain at rest, unless it is acted upon by an external force.
Hence, inertia affects the motion of an object or a physical body and it is greatly dependent (influenced) by its mass.
In this scenario, a book lying on the car seat when the car stops, will continue to move forward because the book's inertia causes it to continue in motion (moving).
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