- #1

matt@USA

- 25

- 0

## Homework Statement

A force of magnitude 7.50N pushes three boxes with masses m1=1.3kg, m2=3.2kg, and m3= 4.9kg as shown in the figure. I want to find the magnitude of the contact forces between boxes 1 and 2, and between boxes 2, and 3. Now, the force, 7.5N is being pushed from right to left on box m3. We are assuming that friction is irrelevant in this problem.

## Homework Equations

I know to find the acceleration, I add the three masses together, and divide the total into the force. To find the magnitude of the contact force, f12, I would simply say f2-f1. For contact force f23, I would do the same, except I would say f3-f2. I solved the problem, but when I submitted the answers, they were incorrect. CAN SOMEONE PLEASE DOUBLECHECK TO SEE IF I DID SOMETHING WRONG?

## The Attempt at a Solution

I came up with f1=-1.04N, f2=2.56N, and f3=3.92N.

f2-f1=2.56N+1.04N?