# Homework Help: Velocity of sliding object

1. Feb 20, 2013

### vic05

1. The problem statement, all variables and given/known data
Block slides down a 1 meter ramp at a 30 degree angle. The coefficient of kinetic friction is 0.4
what is the block's speed at the bottom of the ramp?

2. Relevant equations

kineticFriction force = coefficient of friction X normal Force

normal Force = force of gravity + mass*acceleration

3. The attempt at a solution

I've tried the problem but i get stuck of finding the normal force required to find the kinetic friction force. Can someone guide me a little bit please... thank you in advanced

2. Feb 20, 2013

### Basic_Physics

The normal force and the component of the weight of the block need to cancel each other out.

3. Feb 20, 2013

### vic05

solved!! the professor gave us a formula but I copied it wrong... just for reference the formula which gave acceleration was a = g[sinO - UkcosO]

4. Feb 20, 2013

### Basic_Physics

Physics not about memorizing formulas, it is about deriving them from first principles, so can you?

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