দেয়া আছে, y=20 sinωt+δ
t=30s এ, y=5 cm ∴5=20 sinω×0+δ
⇒sinδ=520=0.25 ∴δ=14.477∘=14.477×3.14180=0.2527 rad
∴10s পরের দশা =ωt+δ=2πTt+δ=2×3.1430×10+0.2527
=2.346 rad Ans
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