Posted by **Richard** on Monday, November 3, 2008 at 12:08am.

An upright spring which is normally 3 m is compressed 2.3 m and a 2 kg block is placed on it. When it is 5 meters above the ground it is going 10 m/s. What is the spring constant of the spring? How high will the block travel?

- Physics -
**drwls**, Monday, November 3, 2008 at 2:32am
The compressed potential energy of the spring is (1/2) k X^2.

This equals thesum of gravitational poteneital and kinetic energy at any altitude after it is launched.

(1/2) k (3)^2 = (1/2)M V^2 + M g H

V = 10 m/s when H = 5 m

Solve for k

For the additional height it travels, use conservation of energy to determine how much higher it goes when the velocity and KE goes to zero.

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