Starting from the origin, a body oscillates simple harmonically with a period of 2 s . After what time will its kinetic energy be 75% of the total energy?

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2 1 ​ m v 2 = 4 3 ​ ( 2 1 ​ m v m a x 2 ​ ) A 2 ω 2 cos 2 ω t ⇒ 4 3 ​ A 2 ω 2 cos ω t = 2 3 ​ ​ ω t = 6 π ​ ⇒ t = 6 1 ​ sec

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