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Q1. What is the frequency of ultrasound in a medium if he wave length is 3.0 x 10^-3 m and velocity is 1300 mm/ms?

Q2. An object of mass m is sliding with speed v0 at some instant across a level tabletop, with which its coefficient of kinetic friction is. It afterwards moves through a distance d and comes to rest. Which equations for the speed v0 is reasonable (choose one)? And Why?

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