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Q. A helicopter is ascending vertically with a speed of 5.98. At a height of 149 above the Earth, a package is dropped from a window. How long till the package hits ground?

Q. A sound source emits sounds of frequency 200 Hz that travel through still air at 340 m/s. The listener moves at 70 m/s relative to still air toward the stationary source. What is the wavelength of the sound between the source and listener?

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