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## Homework Statement

A body of mass "m" is let go from on top of a surface A, where it slides down to B(without friction). From that point on, it displaces itself on an horizontal surface 5 meters away from B, where it stops at C.

Being "m" a mass in kg

"h" in meters and g = 10 m/s^2

The value, in newtons, of the constant friction force F when the body dislocates itself is:

## Homework Equations

Ei = Ef

W = F.d

## The Attempt at a Solution

My attempt was to set the change in kinetic energy equal to the total work. So therefore:

1/2mv^2 - mgh(converted from gravitational potential energy) = Tf

at the very end, velocity will be zero because it stops so:

-mgh = Tf

replacing the work done by friction:

-mgh = -F.5

.'. F = (10mh)/5 = 2mh

Is this approach correct? Would you guys suggest another one? Is another possible?

Thanks