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In cricket What technology is used to measure the speed of a the ball delivered by bowler?
What parameter used to measure this speed?

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Usually a Radar Gun, similar to what they use to test the speed of cars, is aimed down the pitch and uses a radio transmitter and receiver with the Doppler effect principle.

Hawkeye also usually uses 6 cameras and each of them measure the distance the ball has gone and how long it took and then uses this in the Speed= Distance/Time equation.

Hope that helps =D

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