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Homework Statement
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The force constant of a spring is 600 N/m and the un-stretched length is 0.72 m. A 3.2-kg block is suspended from the spring. An external force slowly pulls the block down, until the spring has been stretched to a length of 0.86 m. The external force is then removed, and the block rises. In this situation, when the spring has contracted to a length of 0.72m , the upward velocity of the block is = ?
Homework Equations
Conservation of Energy
Initial Potential Energy + Initial Kinetic Energy = Final Potential Energy + Final Kinetic Energy
The Attempt at a Solution
0 + 0.5(600)(0.14)^2 = 0.5 x 3.2 x v^2 + 0
v = 1.92m/s?
This is incorrect. The four options given are
a) 1.0 m s b) 5.1m s c) 7.4 m s d) 9.1 m s e) 9.7 m sDo I need to account for gravitational potential energy in the equation?
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