Two masses accelerate towards each other

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SUMMARY

The discussion centers on the physics problem of two masses accelerating towards each other, emphasizing the necessity of demonstrating prior effort before seeking assistance. Participants highlight the importance of applying Newton's second law, F=ma, but stress that this alone is insufficient for a comprehensive solution. A recommendation is made to begin with a diagram illustrating the general position of the masses, and to formulate an ordinary differential equation (ODE) to progress towards a solution.

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Janek
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Homework Statement
Hey, I have problem which I have no idea how to solve:
https://ibb.co/5n8JX6m
As you can see: There are 2 equal masses m connected by a massless string with length 2l. Now a constant force F attacks at the center of the string (at P) and pushes the string upwards so that the masses accelerate in x direction towards each other. Find a formula for the acceleration a depending on the time. Thank you for hints and solutions :)
Relevant Equations
F=ma
.
 
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Start with a diagram of the general position, not the initial position.
But I see no way to get a solution in closed form. Try to get an ODE at least.
 
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