Amy gets up from her seat on a train to move closer to the front. just as she begins to walk forward, the train stops at a station. what is the best explanation of what happens to amy?

a. while amy is walking, her body is in motion. when the train stops, because she's not buckled in, amy continues to move forward due to inertia.

b. while amy is walking, her body is in motion. when the train stops, an unbalanced force accelerates her body backward.

c. while amy is walking, her body is in motion, but as the train stops, it exerts a force on amy opposite to the direction she is walking, causing her to stop as well.

d. while amy is walking, she is in motion due to the force of repulsion. when the train stops, she is catapulted forward due to the train's stronger force of attraction.

my best guesses would be d or c, but only from what common sense tells me. answer and explanation, ? guys!

1. the materials manager for a billiard ball maker must periodically place orders for resin, one of the raw materials used in producing billiard balls. she knows that manufacturing uses resin at a rate of 50 kilograms each day, and that it costs $.04 per day to carry a kilogram of resin in inventory. she also knows that the order costs for resin are $100 per order, and that the lead time for delivery is four (4) days.2. at what point should resin be reordered? a. 0 kilograms remainingb. 50 kilograms remainingc. 200 kilograms remainingd. 400 kilograms remaininge. 500 kilograms remaining3. if order size was 1,000 kilograms of resin, what would be the length of an order cycle? a. 0.05 daysb. 4 daysc. 16 daysd. 20 dayse. 50 days4. if the order size was 1,000 kilograms of resin, what would be the average inventory level? a. 50 kilogramsb. 200 kilogramsc. 500 kilogramsd. 800 kilogramse. 1,000 kilograms5. if the order size was 1,000 kilograms of resin, what would be the daily total inventory costs, excluding the cost of the resin? a. $5b. $10c. $20d. $25e. $40