Question
Asked Mar 2, 2020
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Bumpers are built with springs that compress to provide a stopping force without, hopefully, denting the metal. Bumpers on cars are not of much use in a collision. To see why, calculate the magnitude of average force (to the nearest Newton) a bumper would have to exert if it brought a 1,870.99-kg car (a so-called compact model) to a rest in 15 cm when the car had an initial speed of 1.8 m/s. 
 
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Step 1

It is given that

Physics homework question answer, step 1, image 1

Step 2

To find the force, we need to find the acceleration. Using newton’s third equation of motion,

Physics homework question answer, step 2, image 1

 

Step 3

Force is given as,

Physics homework question answer, step 3, image 1

 

...

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