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**1. Homework Statement**

2 objects each with mass, m, and radius, r, are unaffected by any other objects. They are the distance L apart. At time t=0 , both are at rest. From then on they accelerate towards each other.

Determine the speed of the planets at the moment of collision.

**2. Homework Equations**

From assignment: "Use a= dv/dx * v in order to solve the problem".

Newtons law of gravitation: Fg= G m^2/(r^2)

**3. The Attempt at a Solution**

Well I would think that I'm supposed to make 1 or 2 differential equations, which I can then solve specifically by x_0=0 .

My problem is writing the equations, can anyone help, please?

**1. Homework Statement**

**2. Homework Equations**

**3. The Attempt at a Solution**