# Homework Help: Simple physics

1. Jan 22, 2010

### physics102

1. The problem statement, all variables and given/known data

A box with a mass of 12kg rests on a horizontal surface. The coefficient of kinetic friction between the box and surface is 0.50. The box is connected to a rope that passes around a pulley and suspends a second box of mass 24kg. What is the acceleration of the second box?

2. Relevant equations

3. The attempt at a solution

A) 9.8m/s2 [down]
B) 6.5m/s2 [down]
C) 0.5m/s2 [down]
D) 4.9m/s2 [down]

which one?
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution

2. Jan 22, 2010

### fluidistic

First of all, welcome to PF!
Second, here you must show an attempt, otherwise we don't have a clue about where you're stuck.
Regarding the problem, I suggest you to draw a free body diagram for each block and use the fact that the net force is worth mass times acceleration. (Newton' second's Law)