Initial velocity is the original starting velocity. I love math! It makes you smart like a math smart person.
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Deceleration (or negative acceleration).
v1 = initial velocity v2 = final velocity
There are different formulae for calculating these variables which depend on what information is available.
20.40
You need velocity at two points in time, and the acceleration must be constant. If the initial velocity is u ms-1 and the final velocity is v ms-1, and the time interval is t then t = (v - u)/a s.