Question

sally gets up from her seat on a train to move closer to the front. as she begins to walk forward, the train stops. what happens to sally? while sally is walking, her body is in motion. when the train stops, she is catapulted forward due to the trains stronger force of attraction. while sally is walking, her body is in motion, but as the train stops, it exerts a force on sally opposite to the direction she is walking, causing her to stop as well. while sally is walking, her body is in motion. when the train stops, she continues to move forward due to inertia. while sally is walking, her body is in motion. when the train stops, an unbalanced force accelerates her body backward.

Explanation:

According to Newton's first law of motion (the law of inertia), an object in motion tends to stay in motion with the same speed and in the same direction unless acted upon by an unbalanced force. Sally is walking forward on the moving train, so her body has a forward - moving inertia. When the train stops, there is no immediate force to stop her body's forward motion, so she continues to move forward.

Answer:

While Sally is walking, her body is in motion. When the train stops, she continues to move forward due to inertia.