A mass is attached to a spring stretches it 2.5 cm from equilibrium. The mass is lightly tapped and set in an oscillation. What is the angular frequency of the of the oscillation?
The trick here is finding k.
mg=kx
k=m(9.8/.025)
then go here to find w
http://hyperphysics.phy-astr.gsu.edu/hbase/shm2.html