Simple harmonic

Question

A block on a horizontal frictionless surface is attached to an ideal massless spring whose spring constant is 150 N/m. The block is pulled from its equilibrium positin to x= +0.080m and is released from rest. The block then executes simple harmonic motion along the horizontal x-axis.

Find the angular frequency of the oscillations.

Express the displacement of the block x as a function of time t.

Answer 1

f=(1/2π)(k/m)^1/2  x(t)=Acosωt= 0.08cosωt and ω=(k/m)^1/2

 Thus, to solve the problem you need to know mass as well.