Crashworthiness means how safe a car, plane, or any other vehicle is in case it gets into an accident or a collision.
Imagine you are playing with your toy car and you bump it into the wall. Your car might get scratched or dented, and maybe even lose a wheel.
But when grown-ups drive real cars, they need to be very careful because accidents can be very dangerous. That's why car makers try to make sure that the cars they build are safe in case of an accident.
To make cars safer, they are designed to protect people inside them. This means that the cars have special materials and structures that can absorb the impact of the collision, so that the people inside don't get hurt as much.
For example, the car might have a strong frame made of metal or other strong materials that can protect the people inside from getting crushed. The car might also have airbags that pop out when the car crashes, which can help protect the people inside from hitting hard surfaces inside the car.
In brief, crashworthiness is all about making sure that vehicles are built in a way that can protect people from getting injured or killed in case of accidents or collisions.