- #1

alingy1

- 325

- 0

## Homework Statement

A vertical spring of negligible mass and spring constant k=1000N/m has a small object of mass M=5.0kg placed on its top. The spring is held compressed by distance of 25 cm from equilibrium position. The spring is released. Find speed of mass at equilibrium position.

## Homework Equations

W spring=1/2kdeltax^2

W gravity=deltax*5*9.8

Total energy gain of mass=19J

Energy transferred into potential: 12.25J=mgh

Energy transferred into kinetic: 6.75J ---->v=1.64m/s

## The Attempt at a Solution

The answer booklet says the answer is 2.76m/s!

Where did I go wrong?