Answer:
ω = 14.14 radian /s
2.82 ms⁻¹
Step-by-step explanation:
In a spring mass system the angular frequency is given by the expression
ω =

Where k is spring constant which is given as 20 N/m and m is mass of the hanging mass which is given as .1 kg
Put the values in the given equation
ω =

ω = 14.14 radian /s
b ) When displaced by .2 m and then allowed to oscillate it will do it with the amplitude A of 0.2 so
A = .2
Maximum velocity ie velocity at equilibrium will be equal to
ωA
= 14.14 X .2 = 2.82 ms⁻¹