Final answer:
Increasing the impact time during a collision decreases the force exerted. This is due to the impulse-momentum theorem, which connects force, time, and the change in momentum. Crumple zones in cars illustrate this principle by reducing forces on passengers in a crash.
Step-by-step explanation:
How does increasing the impact time affect the force in a collision? Increasing the impact time decreases the force involved in a collision. This relationship is described by the impulse-momentum theorem, which states that the impulse on an object, or the change in momentum, is equal to the product of the average force applied and the time for which it is applied. When the time of impact is increased, for a given change in momentum, the average force exerted on the object must be reduced.
Cars with crumple zones are a practical example of this principle. The crumple zones are designed to increase the time over which a collision occurs, thereby reducing the forces on passengers, which in turn reduces the likelihood of injury.
Therefore, the correct answer to the question is B. It will decrease the force.