# Inclined plane

## Homework Statement

A block (starting from rest) with mass m = 4.5 kg slides down a frictionless incline a distance of d = 3m and then slides across a horizontal floor with friction (the coefficient of friction is Fk = 0.52). The speed of the block at the bottom of the incline is v1 = 7m/s. What is the angle of the incline? (Assume the acceleration was constant.)

## Homework Equations

v initial = 0
mgsin(mu) - ƒk = ma

## The Attempt at a Solution

I am wondering if I am approaching this correctly.
mgsin(theta) - ƒk = ma

Last edited:

LowlyPion
Homework Helper

## Homework Statement

A block (starting from rest) with mass m = 4.5 kg slides down a frictionless incline a distance of d = 3m and then slides across a horizontal floor with friction (the coefficient of friction is Fk = 0.52). The speed of the block at the bottom of the incline is v1 = 7m/s. What is the angle of the incline? (Assume the acceleration was constant.)

## Homework Equations

v initial = 0
mgsin(mu) - ƒk = ma

## The Attempt at a Solution

I am wondering if I am approaching this correctly.
mgsin(mu) - ƒk = ma

I hope you mean mgsinθ.

I would be concerned if you were trying to plug in μ, usually used for the coefficient of friction, as the angle.

sorry -- that's what I meant. All the greek letters -- uggh.

LowlyPion
Homework Helper
As to the problem, the equation you have doesn't address the basic acceleration down the incline, if your statement of the problem is correct in saying the incline is frictionless.