Posted by **Cory ** on Thursday, December 10, 2009 at 6:53pm.

A vertical spring (k = 1040 N/m) is compressed a distance of 11.6 cm. A 47.9 g mass is placed on the spring, then released so the mass flies upward. When the mass is 120 cm above the spring, what is the speed of the mass?

- physics -
**drwls**, Thursday, December 10, 2009 at 7:25pm
Let Y be the elevation from the compressed position. When released and after reaching elevation Y = 0.12 m, the kinetic energy is the initial spring potential energy minus the gain ib gravitational potential energy.

KE = (PE)spring - (PE)gravity

(1/2)(0.0479 kg)V^2 = (1/2)k(0.116m)^2 - (0.0479)(9.8 m/s^2)(0.12 m)

Solve for V

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