Question

how to measure speed of a moving ball? ​

Answer 1

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Speed = Distance Time.

Time.Speed = Δs Δt.

1 m 1 s × 1 km 1000 m × 3600 s 1 h = 3600 m · km · s 1000 s · m · h = 3.6 km 1 h.

Velocity = Displacement Time in a direction.

Answer 2

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Speed is the rate at which an object's position changes, measured in meters per second. The equation for speed is simple: distance divided by time. You take the distance traveled (for example 3 meters), and divide it by the time (three seconds) to get the speed (one meter per second).