A 2000 Kg car is driving 15 m/s. It drives head-on into a giant spring attached to a brick wall. The spring compresses 8 meters after the impact. What is the
spring coefficient of the giant spring? *

The spring constant is k=7031.25

Explanation:

We start by using the conservation of mechanical energy:

Ui + Ki = Uf + Kf

the Ui (initial potential energy) is zero since the spring is relaxed.

In the final situation, the Kf (final kinetic energy is zero since the car and spring are NOT in motion)

Then we have:

! 55 !  

write a paragraph or story to explain the transformation between potential and kinetic energy as shown in your picture or model.  

you should have at least 5 complete sentences with a main idea and supporting details.  

you must include the following words:  

potential energy

kinetic energy

mechanical energy

conservation of energy

dude, this is hard lol : ))

be subject to a force andchange its motion