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Physics 7 Online
OpenStudy (anonymous):

A vertical wind screen of a car is made up of 2parts,where the upper one A is 20 cm vertically long and covers the top 5cm of the lower piece B.The upper one is hinged at the top so that it can be opened outward,inclinig to the vertical.The car is running on the horizontal road at 60 km/hr.Find the max. angle ,through which the upper part A can be opened outward ,such that the rain drops do not ener the car

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