The time period would be 1.256s
The period, which is the length of each full oscillation, is constant. T = 2 Square root of L/g, where L is the pendulum's length and g are its acceleration owing to gravity, is the formula for a pendulum's period. There exists a formula that gives the period of oscillation:
T=2π√m/k.
So:
T=2⋅3.14⋅√4kg / 10 nm⁻¹
=6.28⋅√0.4kg/kg⋅ms
=6.28 x0.2
=1.256 s
therefore, the calculated time period is 1.256 s.
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