How to measure g?

The figure shows a method for measuring the acceleration due to gravity. The ball is projected upwards by a "gun" . The ball passes the electronic" gates"1 and 2 as it rises and again as it falls . Each gate is connected to a separate timer . The first passage of the ball through each gate starts the corresponding timer ,and the second passage through the same gate stops the timer . The time intervals \(t_{1}\) and \(t_{2}\) are thus measured . The vertical distance between the two gates is "d". If d=5m and \(t_{1}\)=3 s and \(t_{2}\) =2 s , the find the measured value of acceleration due to gravity in S I. Units.

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