0-60 mph Estimator (Educational) mechanism

Model scope

The base arithmetic is correct only conditionally: time_s = k × sqrt(weight_lb / hp). Final approval requires the exact published calibration constant and citation, the calibration range and error metrics, and an explicit drivetrain adjustment formula. The supplied k = 1.25 and neutral factor = 1.0 in the vectors are illustrative test parameters, not validated production values.

• The stated formula is a plausible empirical correlation, but there is no universal standard value for k; the calibration constant, reference dataset, fitted domain, and source citation are missing.
• The input includes drivetrain type and promises an adjustment factor, but the formula does not define any drivetrain adjustment factor or how it modifies time_s.
• The formula is only conditionally valid within the calibration range; extrapolation to unusual vehicle weights or horsepower values is not justified.
• The formula assumes horsepower is a comparable power rating across vehicles and does not specify whether engine, crank, or wheel horsepower is required.

Units and conventions

• weight_lb must be vehicle weight expressed in avoirdupois pounds, not kilograms or mass in another unit.
• hp must be horsepower using the same horsepower definition as the calibration dataset; engine/crank horsepower and wheel horsepower are not interchangeable.
• k has units of seconds divided by the square root of lb/hp, so its numeric value is valid only with weight in pounds and power in horsepower.
• The test vectors use an illustrative k = 1.25 and a neutral drivetrain adjustment factor of 1.0 solely to demonstrate the arithmetic; the spec must provide and cite the actual calibrated value.
• The output time_s is in seconds.

Inspectable vector

One of 4 source-bound review vectors:

{
  "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."
}

Failure boundary

BREAK_CLAIMED · SELF_FLAGGED

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.

Other records

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
• BOUNDARY_HAZARD_CATALOG.json