A young female wears her lap belt low, over her upper thighs, because the belt is uncomfortable when worn properly. If involved in a head-on "up and over" type collision, to what injury is she most prone, given the position of her lap belt?
A) Internal abdominal injury
B) Dislocated hips
C) Tibia-fibula fractures
D) Bilateral arm fractures

The correct answer here is B) Dislocated Hips

Explanation:

Due to the force of the of the collision which causes a forceful "up and over" pull over her body, hips is likely to get dislocated.

If worn properly, the lap belt will hold her in place preventing her upper torso which is heaver than her lower body mass (that is the hips and below) from reacting to the forceful conversion of potential energy to kinetic energy.

When her body, having used the belt erroneously, goes into a full kinetic jump, the weight of the upper torso will pull the most at the hips thus leading to the dislocation.

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