I having trouble answering this one. I already had to calculate the change in potential energy but am now stuck. A stick with a mass of 0.168 and a length of 1.00 is pivoted about one end so it can rotate without friction about a horizontal axis. The meter stick is held in a horizontal position and released. 1) As it swings through the vertical, calculate the angular speed of the stick. I thought I could answer this by using the equation: (ω_f)^2 = (ω_i)^2 + 2α Δθ This does not work and I don't know where to go from here. 2) As it swings through the vertical, calculate the linear speed of the end of the stick opposite the axis.