PHYSICS · Multi-part · CBSE · Physics · Laws of Motion · Laws of Motion
Problem
During a crash test two identical cars, A and B, of mass 1.2×103kg each strike a rigid wall and come to rest from 25m/s. Car A has a crumple zone that brings the passenger cabin to rest in 120ms, whereas Car B (without a crumple zone) stops the cabin in 30ms. For force estimates take the effective mass of the occupant as 70kg.
(a) Calculate the average force experienced by the occupant in Car B.
(b) Find the ratio of the average forces on the occupant in Car B to Car A and state which design offers better safety.