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1. A body moving through the air at a speed v, experience a retarding force f, given by f= KAPv-square where A is the surface area of the body, p is the density of air and K is a numericalconstant.

find the value of × and d expression of f.
2. A particle of mass M attached to a string of Length r is whirsted round in a circle with a speed U..
find the form of the expression for the tension in the string?

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