Given, mass of the particle, m=0.4‌kg Amplitude, A=0.4m Initial phase, ϕ=
Ï€
4
Kinetic energy at mean position KE =256×10−3J As, KE=
1
2
mω2A2 where, ω is angular frequency. ⇒
1
2
mω2A2=256×10−3 ⇒
1
2
×0.4×ω2×(0.4)2=256×10−3 ⇒ω2=8 ⇒ω=2√2‌rad‌‌‌s−1 Equation of simple harmonic motion is given by x=A‌sin(ωt+ϕ) =0.4‌sin[(2√2)t+