## A brick of mass 1.0 kg slides down a roof inclined at 30.0 degrees with respect to the horizontal. If the coefficient of friction is 0.10, how fast is it moving when it reaches the edge of the roof 2.00 m away?

Question

A brick of mass 1.0 kg slides down a roof inclined at 30.0 degrees with respect to the horizontal. If the coefficient of friction is 0.10, how fast is it moving when it reaches the edge of the roof 2.00 m away?

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General Physics
5 years
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## Answer ( 1 )

a = gsinθ – μgcosθwhere a-accelerationg-gravityμ-coefficient of frictiona = gsinθ – μgcosθ= 9.8*sin(30) – 0.1 * 9.8*cos(30)= 4.051 m/s^2Speed = sqrt(2as)= sqrt(2*4.051*2)= 4.025 m/s