What is the rms speed of nitrogen molecules contained

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Q. Two 2.0 kg bodies, A and B, collide. The velocities before the collision are A = (15i + 30j) m/s and B = (-10i + 5j) m/s. After the collision, ′A = (-5i + 20j) m/s. What are (a) the x-component and (b) the y-component of the final velocity of B? (c) What is the change in the total kinetic energy (including sign)?

Q. What is the rms speed of nitrogen molecules contained in an 7.9 m3 volume at 2.1 atm if the total amount of nitrogen is 1100 mol?

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