Question

A person has a reasonable chance of surviving an automobile crash if the deceleration is no more than 30 g's.

a. Calculate the force on a 68-kg person accelerating at this rate.

b. What distance is traveled in meters if brought to rest at this rate from 95 km/h?

Answer 1

a)

$F=ma=30mg=20~kN.$

b)

$s=\frac{v^2}{60g}=1.2~m.$