A passenger of mass is travelling in a car at

PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials

Problem

A passenger of mass

60\,\text{kg}

is travelling in a car at

72\,\text{km h}^{-1}

. During a collision the passenger is brought to rest by an airbag in

50\,\text{ms}

. If the same collision occurs without an airbag and the passenger comes to rest in

5\,\text{ms}

, by what factor does the airbag reduce the average force on the passenger? (a)

5

(b)

9

(c)

10

(d)

20