posted by Ame .
A block of mass m = 2.00 kg is attached to a spring of force constant k = 5.15 102 N/m that lies on a horizontal frictionless surface as shown in the figure below. The block is pulled to a position xi = 5.75 cm to the right of equilibrium and released from rest.
(a) Find the the work required to stretch the spring.
(b) Find the speed the block has as it passes through equilibrium.
work=energy in spring=1/2 k x^2
KE=energy in spring