Doubt from simple harmonic motion

Is this the answer for b

dont know ans for second can u post ur approch??

No I made a mistake here ..will do correctly and send

My approach is this
@Shwetanshu_2018 Pls Check this

I didn’t take gravity into account as it’s constant force (the system will be already in its equilibrium)
All x used in below are just the extensions from equilibrium

@Sneha_2021 from where did you take this q

coaching material..

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@Viram_2019 sir , @pratyaksh_2019 sir @Unik_2018 sir
1st one..