The kinetic energy of an object attached to a horizontal idealspring is denoted

Question

The kinetic energy of an object attached to a horizontal idealspring is denoted by KE and the elastic potential energy by PE. Forthe simple harmonic motion of this object the maximum kineticenergy and the maximum elastic potential energy during anoscillation cycle are KEmax and PEmax,respectively. In the absence of friction, air resistance, and anyother nonconservative forces, which of the following equationsapplies to the object-spring system? (A) KE + PE = constant
(B) KEmax = PEmax A, but not B Aand B     Neither A, nor B B,but not A (A) KE + PE = constant
(B) KEmax = PEmax A, but not B Aand B     Neither A, nor B B,but not A A, but not B Aand B     Neither A, nor B B,but not A

Explanation / Answer

Both A & B are correct. At the midpoint of the motion the PE is zero and the KE is ata maximum At the endpoints of the motion PE is a maximum and KE iszero PE + KE = constant at all points of the motion

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