Mixed motion and the double-curve path of a thrown ball
Suspended-rod balances above a curve m n t showing velocity lost then regained
The upper half of the sheet holds two rods suspended by cords, with weights and numeric labels tallying the balance. Below, a double curve marked a b c and m n t illustrates mixed motion, which Leonardo calls natural-and-violent, whose degrees of gaining and losing velocity vary irregularly. He explains that a ball thrown up the slope m n keeps losing velocity from m to n, then from n to t regains exactly the same velocity it had lost.
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Mixed natural-and-violent motion
Mixed motion, that is natural-and-violent, has its degrees of gain and loss of velocity in irregular variety. Leonardo presents the double curve as an example serving what he had stated above.
The ball on the curve m n t
A ball thrown up the slope m n always loses velocity from m as far as n, and from n to t regains that same velocity which it had lost. The lettered points a b c and m n t anchor the argument to the drawn curve.
Weights on the two suspended rods
The two upper rods hang from cords with weights at their ends, recorded by the numeric pairs along each arm. They continue the running study of balance carried through these folios.