Oscillations

• x(t)=xm cos(?t+?)

• v(t)=- ?xm sin (?t+ ?)

• vm= ?xm ‘amplitude’

• shifted by T/4 (900)

• a(t)=- ?2xm cos(?t+ ?)

• am = ?2xm ‘amplitude’

• shifted by 2T/4 (1800)

• d2x/dt2 =- ?2x

x(t) = xm cos(?t +? )

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