Work out the speed of propagation of the wave

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Q1. An archer shoots an arrow horizontally at a target 12 m away. The arrow is aimed directly at the center of the target, but it hits 56 cm lower. What was the initial speed of the arrow?

Q2. A stretched string is observed to vibrate with frequency 30Hz in its fundamental mode when the supports are 60.0 cm apart. The amplitude at the antinode is 3.0 cm. The string has a mass of 30 g. work out the speed of propagation of the wave and the tension in the string.

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