Answer:
The first is the closest in absolute values.
The second two are vague and the last is approximate.
The short answer (and the long one for that matter) is physical properties of chemicals. If you are being marked by a machine, likely the answer is going to be physical properties.
Spring potential energy:
E = 0.5 * k * x²
k spring constant
x spring compression
x = √(2 * E / k) = 0.7
She is traveling at a constant speed.
