The kinetic energy of a mass connected to a spring
will be maximum in:
(a) stretched position (b) mean position
(c) compressed position (d) motionless position
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Stretched Position
Explanation:
The mass has reached its maximum speed so, the Kinetic Energy of the mass is at a maximum. At rock bottom of the motion. The Potential Energy of the spring is at a maximum since the spring is stretched at its maximum extension.
After a mass attached to the free end of the spring is released, it oscillates back and forth. Its Kinetic Energy and Potential Energy stay constant. Because the mass passes through the equilibrium point, the Kinetic Energy reaches its maximum.
When the Kinetic Energy is maximum, the Potential Energy is zero. This happens when the speed is maximum and therefore the mass is at the equilibrium position. The Potential Energy is maximum when the speed is zero.
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