What does each of the letters stand for F=d^2s/dt^2?
I know F stand for force, the rest don't know.

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  1. Well force F = rate of change of momentum P
    momentum P = mass * velocity = m V
    F = d/dt P = d/dt ( m V)
    if mass is constant (usual assumption in rigid body physics at speed much less than light speed
    F = m dV/dt
    V = dx/dt where x is position
    F = m d^2 x/dt^2
    I suspect that this is what you intended to write
    however if s = m x
    then what you typed works

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