Source: https://guthlabs.ai/docs/instruments/momentum-calculator/implementation/

instrument implementation / implementation-contract

# Momentum Calculator implementation

A source-bound implementation contract for Momentum 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**: t4-179

**Effect**: Computation or source lookup only

## Input and validation requirements

The plain-JavaScript arithmetic engine overflows for a valid finite input combination of mass = 10^308 kg and velocity = 10^308 m/s, producing Infinity instead of a finite representable result; the mathematical momentum is 10^616 kg·m/s.

## 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": {
    "mass": 2,
    "mass_unit": "kg",
    "velocity": [
      3,
      -4,
      0
    ],
    "velocity_unit": "m/s"
  },
  "expected_outputs": {
    "p": [
      6,
      -8,
      0
    ],
    "unit": "kg·m/s"
  },
  "working": "p=mv=2 kg×[3,-4,0] m/s=[2×3,2×(-4),2×0]=[6,-8,0] kg·m/s."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/momentum-calculator/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/momentum-calculator/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/momentum-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`