Posted by **Lowell** on Monday, February 28, 2011 at 6:05pm.

A 1200 kg car rolling on a horizontal surface has spped v= 65 km/h when it strikes a horizontal coiled spring and is brought to rest in a distance of 2.9 m. What is the spring stiffness constant of the spring?

- Physics -
**Dan**, Monday, February 28, 2011 at 8:45pm
This problem can be solved with the conservation of energy. The total amount of energy in the car is the same before and after the collision with the spring. The car's kinetic energy before the collision is completely converted to spring potential energy after the collision.

1/2 * m * v^2 = 1/2 * k * x^2

Plug and chug, solve for k

- Physics -
**mhaya**, Tuesday, August 13, 2013 at 7:28am
99173.55 kg s^2

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