# Homework Help: Worker pushes a box

1. Oct 27, 2008

### steelydan8821

1. The problem statement, all variables and given/known data
On a horizontal frictionless floor, a worker of weight 900N pushes horizontally with a force of 200N on a box weighing 1800N

2. Relevant equations

3. The attempt at a solution
I do not know where to start.

2. Oct 27, 2008

### PhanthomJay

What's the question?

3. Oct 27, 2008

### steelydan8821

As a result of the push:
A. the worker and box will both have an acceleration of 2.18m/s^2, but in opposite directions
B. The worker will accelerate at 1.09m/s^2 and the box will accelerate at 2.18m/s^2, but in opposite directions
C. The worker will accelerate at 2.18m/s^2 and the box will accelerate at 1.09m/s^2, but in opposite directions
D. The worker and box will both have an acceleration of 1.09m/s^2, but in opposite directions
E. The box will not move because the push is less than its weight

4. Oct 27, 2008

### PhanthomJay

What have you tried so far?

5. Oct 27, 2008

### steelydan8821

well i think the sum of the forces in the x direction must equal ma
Fx=ma
200N= ((1800N+900N)/9.81)*a
But this can't be right because the value for a doesn't fit the answers

6. Oct 27, 2008

### HallsofIvy

Do you mean "which of these is true"? Is so, it would have helped a lot if you had said that in your first post!

I don't see any need to do ANY calculation. One answer can be thrown out because it is just silly. The correct choice from the other 4 only requires recognizing that the worker has greater mass than the box!

7. Oct 27, 2008

### steelydan8821

the worker has a mass of 900N the box has a mass of 1800N
1800>900