Question

refer to the attachment ​

Answer 1

refer to the attachment

you will find the answer

Answer 2

Given

the body is in simple harmonic motion

a = -bx

x = -a/b

x/a = 1/b

Now we know that time period = 2πf

time period =

2π sqrt(displacement /acceleration)

on putting the value

time period = 2π sqrt (1/b)