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Q1. A 320 kg wooden raft floats on a lake. When a 75 kg man stands on the raft, it sinks 3.5 cm deeper into the water. When he steps off, the raft vibrates for a while.

What is the frequency of vibration?

What is the total energy of vibration (ignoring damping)?

Q2. A helicopter is ascending vertically with a speed of 5.45m/s. At a height of 141m above the Earth, a package is dropped from a window. How much time does it take for package to reach the ground?

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Category:- Physics
Reference No.:- M9172536

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