Solving Homework Equations for Speed

[Power of One]

Homework Statement

1. An 85 g wooden block is set up against a spring. The block is pushed into the spring, compressing it a distance of 2.0cm and then released. k= 78N/m. What is the speed of the block when it reaches its initial point.

2. A 5.0kg crate slides down a smooth ramp that is elevated at an angle of 38 degrees. length of ramp= 2m. What will be the speed of the crate at the bottom of the ramp?

Homework Equations

Us= .5kx^2
Ug= mgh
KE=.5mv^2

The Attempt at a Solution

1. Us= .0156J? I don't know how to find its speed.

Any help you can provide is appreciated. Thanks in advance.

 

[Fightfish]

The solution to both questions lie in the idea of conservation of energy.