Gabriel the Grenadier wants to lob a grenade over a huge barrier in front of him. He models the scenario in the following way:

The grenade is a point mass that is thrown with a variable velocity \(u\), at a variable angle \(\theta\). The barrier is a cylinder with a radius of \(R= 2m\).

Find the **minimum** value of \(u\) (in m/s) for which the particle crosses the log.

**Details and assumptions**

Neglect air resistance and viscosity.

Take \(g=9.8 m/s^2\).

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