Find angle to the rods vertical

[dorian_stokes]

Homework Statement

A rod of mass 4.5 kg and length 1.2 m hangs from a hinge as shown in the figure below. The end of the rod is then given a "kick" so that it is moving at a speed of 5 m/s. How high will the rod swing? Express your answer in terms of the angle the rod makes with the vertical.

Homework Equations

The Attempt at a Solution

 

[tiny-tim]

Hi dorian_stokes!

Hint: use conservation of energy.