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please answer thankyou A block rest on a horizontal board. the board is gradually tilted upward and the block just begin to slide when the

please answer thankyou

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A block rest on a horizontal board. the board is gradually tilted upward and the block just begin to slide when the angle of inclination is 210, a. Find the coefficient of static friction between the block and the board. b. After the block starts moving it is found that it will keep sliding at constant speed when the angle tilt to 15. Find the coefficient of kinetic friction

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