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Q. A tennis player places a 40 kg ball machine on a frictionless surface, as shown below. The machine fires a 0.052 kg tennis ball horizontally with a velocity of 30.6 m/s toward the north. What is the final velocity of the machine?

Q. The distance between two slits in a double slit in a double slit interference experiment is 0.0050mm. What is the angle of the third order bright fringe (m=3) produced with light of 550 nm?

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