A car traveling strikes a stationary barrier and comes to rest

PHYSICS · Single correct · ISC · Physics · Laws of Motion · Laws of Motion

Problem

A 1.2×103 kg1.2\times10^{3}\,\text{kg} car traveling 15 m/s15\,\text{m/s} strikes a stationary barrier and comes to rest. If the car’s safety features increase the stopping time from 0.20 s0.20\,\text{s} to 1.2 s1.2\,\text{s}, which of the following is the ratio of the magnitude of the average net force on the car with the safety features to the magnitude without them? (a) 6 (b) 16\dfrac16 (c) 13\dfrac13 (d) 23\dfrac23

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