At the lowest and highest points on its trajectory, the pendulum cord, with a length L = 2...

At the lowest and highest points on its trajectory, the pendulum cord, with a length L = 2 ft, forms angles ϕ1 = 15° and ϕ2 = 50° with the vertical direction, respectively. Determine the speed of the pendulum bob corresponding to ϕ1 and ϕ2.

Figure P5.84