Such a cool teacher

Mr. Andrew excites his students with his home-made cannon demonstration. The 1.27kg cannon is loaded with a 54 grams cricket ball and placed on the ground. Mr. Andrew fires the cannonball horizontally and determines that the cannon recoiled backwards with a speed of 7.8m/s with help of a photogate measurement and asks his students to determine the speed of the ball. So, what is the speed of the ball in m/s?

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