1- A 8.91 m long pole is balanced vertically on its tip. What will the speed be in meters/seconds of the tip of the pole just before it hits the ground? Assume the lower end of the pole does not slip.

2- what is the angular momentum in kg m^2/s of a 406 G ball rotating on the end of a string and a circle of a radius 1.57M at an angular speed of 7.88 rad/s?

please help with both:) thank you!