A plank with a small block on top of it undergoes vertical SHM. Its period is 2 s. The minimum amplitude at which the block will separate from the plank is:
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A plank with a small block on top of it undergoes vertical SHM. Its period is 2 s. The minimum amplitude at which the block will separate from the plank is:

G1 Physics · Accepted Answer

Loss of contact occurs when N=0, so the maximum downward acceleration of the plank equals g: ω²A=g. With T=2 s, ω=2π/T=π rad s⁻¹. Hence A=g/π²=10/π² m. Correct answer: A.