Four automobile bumpers are designed to protect the car’s occupants in identical…
PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
Four automobile bumpers are designed to protect the car’s occupants in identical low-speed collisions. The table lists the approximate contact time each bumper can provide as the car comes to rest.
Bumper Contact Time (ms)
P 40
Q 60
R 25
S 55
Assuming all collisions involve the same change in momentum, which ranking correctly orders the bumpers from the one that results in the largest average force on the car to the one that results in the smallest average force?
(a) Q>S>P>R
(b) R>P>S>Q
(c) R>S>P>Q
(d) P>Q>R>S