A mass m = 0.1 kg is attached to the end B of an elastic string AB with stiffness k = 16 N/m and natural length `l_0 = 0.25 m`. The end A of the string is fixed. The mass is pulled down so that AB is `2l_0` = 0.5 m and then released. (a) Find the velocity of the mass when the string gets slack for the first time.
(b) At what distance from A the mass will come to rest for the first time after being released.

Answer

(a) `sqrt(5) m//s`
(b) zero