Question

Answer 1

Ta có: \(T=\dfrac{2\pi}{\omega}=2\pi\cdot\sqrt{\dfrac{k}{m}}\)\(\Rightarrow0,5=2\pi\cdot\sqrt{\dfrac{k}{0,4}}\)

\(\Rightarrow k=64N/m\)

\(F_{đhmax}=k\cdot A=64\cdot0,08=5,12N\)

Chọn C.