If you know the distance then you use the equation
d = x0 + v0t = 1/2 at2
if the object starts from rest then v0 = 0
If the object starts at zero distance the x0 = 0
d = 1/2 at2
Squareroot(2d/a) = t
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d=displacement v=initial velocity t=time a=acceleration Our basic formula for displacement: d=vt+.5at2 becomes: t = (√(v2+2ad)-v)/a
That number is what we call the object's "speed".
Time equals distance divided by rate.
Use a stopwatch.
You can calculate a speed by dividing a distance by the time it takes to cover that distance. If you want the instantaneous speed (for situations of variable speed), you need to calculate the distance and time for a fairly short time interval (ideally, the limit, when the time approaches zero).