Source: https://guthlabs.ai/docs/instruments/0-60-mph-estimator-educational/implementation/

instrument implementation / implementation-contract

# 0-60 mph Estimator (Educational) implementation

A source-bound implementation contract for 0-60 mph Estimator (Educational); 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**: t4-151

**Effect**: Computation or source lookup only

## Input and validation requirements

The specification does not provide the empirical calibration constant k or any drivetrain adjustment factors, so ordinary valid inputs cannot produce a numeric estimate. It also does not state input validation behavior for zero or nonpositive horsepower, zero weight, or unit ambiguity; zero horsepower causes division by zero and must be rejected.

## 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": {
    "weight_lb": 3000,
    "horsepower": 200,
    "drivetrain_type": "neutral_example",
    "drivetrain_adjustment_factor": 1,
    "k": 1.25
  },
  "expected_outputs": {
    "time_s": 4.841229
  },
  "working": "weight_lb / hp = 3000 / 200 = 15. sqrt(15) = 3.872983. drivetrain adjustment = 1.0, so 3.872983 × 1.0 = 3.872983. time_s = 1.25 × 3.872983 = 4.841229 s."
}
````

## Other records

[01**Overview**](<https://guthlabs.ai/docs/instruments/0-60-mph-estimator-educational/>)[02**Mechanism**](<https://guthlabs.ai/docs/instruments/0-60-mph-estimator-educational/mechanism/>)[04**Qualification**](<https://guthlabs.ai/docs/instruments/0-60-mph-estimator-educational/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`