* A lumen is the same as Lux and is what many modern light meters will calculate their measurement in. The next step is to calculate the number of watts. One lumen is = 0.001496 watts. This is pretty simple, after you have your total number of lumens from step 2.
Quick Answer. The formula for speed is s = d/t, where s equals the speed, d is the distance covered and t is the time it took to cover the distance. The formula for finding the instantaneous speed at a specific point is found by taking the derivative of the speed equation. Continue Reading.
Your choice of answer to this question determines what you calculate â speed or velocity. Average speed is the rate of change of distance with time. Average velocity is the rate of change of displacement with time. And for the calculus people out thereâ¦ Instantaneous speed is the first derivative of distance with respect to time.