An object of mass **m** is droped from an height **H** and passes through the loop with radius **R** as shown in the image above. At the highest point of the loop , point **A**, the object exerts on the track a force with intensity equal 3 times the gravity force, **3G**.

The height can be given by the following expression: **H** = *x***R**

What is the value of *x*?

Assume there's no friction between the track and the object.

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