Một con lắc lò xo, khối lượng của vật bằng 2 kg dao động theo phương trình x = Acos (ut-o). Cơ năng dao động b=0,125 (9). Tại thời điểm ban đầu, vật có vận tốc v. gia tốc a = 6,25 V3 m/s2.

A. 425 N/m

Độ cứng của là xe là

B. 3750 N/m.

= 0,25 m/s và

D. 100 N/m.

C 150 N/m,

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