Three girls pull a sled. Determine the acceleration.

1. The problem statement, all variables and given/known data
Two girls pull a sled across a field of snow, as shown in the diagram. A third girl pulls backward with a 2.0 N force. If the mass of the sled is 10 kg, determine its instantaneous acceleration.
Attachment 68218

2. Relevant equations
F=ma

3. The attempt at a solution
Sorry, I’m stumped.

Attached Images
File Type: png Screenshot (104).png (3.8 KB)

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