Question

why are modern seat belts more effective than earlier designs? complete the sentences. modern seat belts use to slow passengers down more gradually. these provide slack after have tightened the belt. additionally, seat belts are now worn consistently than they were in the past.

Explanation:

Modern seat - belts use pretensioners to initially tighten the belt in a crash. Then, load - limiters allow some slack to slow passengers down more gradually. Also, due to increased awareness and regulations, seat - belts are worn more consistently now.

Answer:

Modern seat belts use load - limiters to slow passengers down more gradually.
These provide slack after pretensioners have tightened the belt. Additionally, seat belts are now worn more consistently than they were in the past.