- #1

AlexanderIV

## Homework Statement

An object of mass m=2 kg slides down on a track from a height of h = 10 m. The track is frictionless except the horizontal range between the points A and B. The friction force is constant between A and B. What is the speed of the object at point B if the magnitude of the friction force between A and B is f = 10 N (take g = 10 m/s2) .

## Homework Equations

F = m (dv / dt)

KE = 1/2 mv^2

## The Attempt at a Solution

The potential energy while sliding down would be U=mgh=2x10x10=200 J[/B]

I have no idea what to do after this point.