SUVAT Kinematics Solver implementation

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

live-source boundary

Effect

Computation or source lookup only

Input and validation requirements

The solver can encounter an undefined 0/0 computation and an underdetermined solution when a = 0 and u = v. It can also produce two valid nonnegative time branches for the same supplied u, a, and s, so a unique output is impossible without a branch-selection rule. Additionally, interpreting s as distance instead of signed displacement changes the result from 16 m to 34 m.

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": {
    "u": 5,
    "a": 2,
    "t": 4,
    "units": "u in m/s; a in m/s^2; t in s"
  },
  "expected_outputs": {
    "v": 13,
    "s": 36,
    "units": "v in m/s; s in m"
  },
  "working": "v=u+at=5+(2)(4)=5+8=13 m/s. s=ut+½at²=(5)(4)+½(2)(4²)=20+1(16)=36 m."
}

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-tranche2/batch10-output.jsonl