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## Homework Statement

Two masses are connected by a string which passes over a frictionless, massless pulley. One mass hangs vertically and one slides on a horizontal surface. The horizontal surface has a coefficient of kinetic friction 0.2. The vertically hanging mass is 4.0 kg and the mass on the horizontal surface is 6.0 kg. Find the acceleration of the mass.

## Homework Equations

T=m

_{B}g-m

_{B}a

## The Attempt at a Solution

I've basically done this problem without factoring friction, and this my problem, I don't know how to factor friction.

a = (m

_{B}g)/(m

_{A }+ m

_{B}) is what I used.

Thanks!!