Whether a truck comes to a stop by crashing into a haystack or a brick wall, the stopping force is

Question

Quizplus · Accepted Answer

The stopping force depends on the opposing force that stops the motion. The haystack can provide some resistance, but it is not rigid enough to stop a truck abruptly. On the other hand, a brick wall is solid and unyielding, and it can bring the truck to a sudden halt by applying a large stopping force that the haystack cannot match. Therefore, the stopping force is greater with the brick wall, and the answer is B.

Whether a Truck Comes to a Stop by Crashing into a Haystack