Source: https://guthlabs.ai/docs/instruments/elastic-spring-potential-energy-calculator/implementation/

instrument implementation / implementation-contract

# Elastic/Spring Potential Energy Calculator implementation

A source-bound implementation contract for Elastic/Spring Potential Energy Calculator; deployment and executable qualification remain separate.

Status: **VERIFIED_CLEAN**Lifecycle: **implementation-contract**

## Binding contract

This record describes what an executable surface must bind and validate. It does not claim that a public calculator, package, or production route is deployed.

**Record owner**: Guth Instruments

**Lifecycle**: verified-clean

**Evidence ID**: t4-155

**Effect**: Computation or source lookup only

## Input and validation requirements

The extreme finite inputs k=10^308 N/m and x=10^154 m produce a mathematically finite value of 5×10^615 J but overflow ordinary JavaScript numeric arithmetic to Infinity.

## Required corrections

No binding erratum is attached to this unique-name record. Implementers must still preserve the declared units, domain, and failure behavior.

## Inspectable interface fixture

The sample below is evidence for interface and validation tests, not a production implementation.

````
{
  "inputs": {
    "k": 200,
    "k_unit": "N/m",
    "x": 0.15,
    "x_unit": "m"
  },
  "expected_outputs": {
    "U": 2.25,
    "U_unit": "J"
  },
  "working": "U = ½kx² = ½(200)(0.15²) = 100(0.0225) = 2.25 J"
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/elastic-spring-potential-energy-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/elastic-spring-potential-energy-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/elastic-spring-potential-energy-calculator/qualification/>)

## Sources and evidence

These pointers bind the page to evidence. They do not grant authority or collapse verification into deployment.

- `VERIFIED_LEDGER.json`

- `evidence-tranche4/tranche4-results.json`