Question

You are the design engineer in charge of the crashworthiness of new automobile models. Cars are tested by smashing them into fixed, massive barriers at 56 km/h . A new model of mass 1800 kg takes 0.14 s from the time of impact until it is brought to rest.

Answer 1

Those kind of question have the force and the acceleration as a questions

`a=111.11m/s^2`

`F=200kN`

Step-by-step explanation:

Calculate the force exerted on the car by the barrier and the acceleration of the motion.

`v=56 (km)/(h)*(1000m)/(1km)*(1h)/(3600s)=15.56m/s`

`F=m*a`

Acceleration is the derive of the velocity so:

`a=(dx)/(dt)=(15.56m/s)/(0.14s)=111.11m/s^2`

Now replacing to find force

`F=1800kg*111.11m/s^2`

`F=200kN`