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Newton approximated motion in a circle as a series of linear motions, as in the polygon below.
img title=Screenshot 2023-03-02 122410.png src=https://d2bps9p1kiy4ka.cloudfront.net/5b09189f7285894d9130ccd0/63746e6a-b7ae-41ee-911f-31f3ac9f5912.png alt= width=93 height=69 /
If we assume the particle moves at constant speed \( v_{A} \) from \( A \) to \( B \), and at constant speed \( -v_{B} \) from \( B \) to \( C \), the direction of the change - in velocity, \( \Delta \overrightarrow{\mathbf{v}} \), at point \( B \), is shown by the  arrow:-
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