physics.js

function getAcceleration(obj) {
    let a = obj.f / obj.m
    let b = obj.Δv / obj.Δt
    let c = (2 * obj.d) / (obj.t * obj.t)
    let e = 'impossible'

    if (typeof(obj.f) == 'number' && typeof(obj.m) == 'number') {
        return obj.f / obj.m
    } else if (typeof(obj.Δv) == 'number' && typeof(obj.Δt) == 'number') {
        return b
    } else if (typeof(obj.d) == 'number' && typeof(obj.t) == 'number') {
        return c
    } else {
        return e
    }
}
// console.log(getAcceleration({}))
// console.log(getAcceleration({ d: 10, f: 2, Δv: 100 }))
// console.log(getAcceleration({ f: 10, Δv: 100 }))
// console.log(getAcceleration({ f: 10, m: 5 }))
// console.log(getAcceleration({ f: 10, m: 5, Δv: 100, Δt: 50 }))
// console.log(getAcceleration({ Δv: 100, Δt: 50 }))
// console.log(getAcceleration({ f: 10, Δv: 100, Δt: 50 }))
// console.log(getAcceleration({ f: 10, m: 5, Δt: 100 }))
// console.log(getAcceleration({ d: 10, t: 2, Δv: 100 }))
// console.log(getAcceleration({ d: 100, t: 2, f: 100 }))