IEk = i mv2 = i m[- A co sin( cot + S )]2 = i mA "co 2 sin 2 (cot + <5) | , = -kx2 =-*[/tcos(<or+^)]: = - kA2 cos 2 (cot +S)
\co~ = k/m-> El = - ntA “ —sin (<af + <?) 2 m