**Unformatted text preview: **gravitational potential energy, , sin 2 2 1 θ mgL kx = or m. 821 . . 37 sin ) s m 80 . 9 )( kg 00 . 2 ( ) m 220 . )( m N 400 ( sin 2 2 2 1 2 2 1 = ° = = mg kx L...

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