Spring problem on work and force

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SUMMARY

The discussion revolves around calculating the speed of a 0.4 kg mass after it is released from a compressed spring with a spring constant of 400 N/m and a compression distance of 0.2 m. Using the principle of conservation of energy, the elastic potential energy stored in the spring is converted into kinetic energy as the mass decompresses. The calculations involve determining the initial kinetic energy and considering the effect of gravitational potential energy when the mass ascends a 0.5 m hill.

PREREQUISITES
  • Understanding of conservation of energy principles
  • Familiarity with potential energy (PE) and kinetic energy (KE) equations
  • Knowledge of spring mechanics, specifically Hooke's Law
  • Basic algebra for solving equations
NEXT STEPS
  • Calculate the initial speed of the mass using the formula for kinetic energy after spring decompression
  • Explore the impact of gravitational potential energy on speed when ascending a hill
  • Learn about Hooke's Law and its applications in mechanical systems
  • Investigate energy conservation in different physical scenarios
USEFUL FOR

Students studying physics, particularly those focusing on mechanics, energy conservation, and spring dynamics.

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Homework Statement



a .4 kg mass compresses a spring of .2m. The spring constant is 400n/m How fast is the mass moving after the mass is released and the spring uncompresses? If the mass is going up a .5m hill, how fast is it going?



Homework Equations



PE+KE=w

PE=mgh

KE=.5mv^2




The Attempt at a Solution



PE=.5(9.8)(x)
 
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To find how fast its moving right after the spring decompresses, use energy conservation. Elastic potential energy is lost, and kinetic energy is gained.

You'll have to clarify the second part -- is the hill 0.5m high? Do you mean how fast is it going at the top?
 
The hill is .5m high
 

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