To calculate the speed of a physical object, you need to know its velocity, which is the rate of change of its position. To find the velocity, you need to know the object's position at two different times. You can calculate the speed by dividing the change in position by the change in time.

Here's an example of how you could calculate the speed of an object using Circom:

template SpeedCalculator(position1: Field, time1: Field, position2: Field, time2: Field, speed: Field) {
    let delta_position = position2 - position1;
    let delta_time = time2 - time1;
    let velocity = delta_position / delta_time;
    speed <= velocity;
}
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