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Q. A coffee filter of mass 1.4 grams dropped from a height of 2 m reaches the ground with a speed of 0.6 m/s. How much kinetic energy Kair did the air molecules gain from the falling coffee filter?

Q. A 0.75 kg mass attached to avertical spring streches the spring 0.30m. what is the spring constant? the mass-spring system is now placed on the horizontal surface and set vibrating. what is the period of the vibration?

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