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Question

The coefficient of friction between a body and the surface of an inclined plane at 45o is 0.5. If g=9.8 m/s2 the acceleration of the body downward is m/s2 is

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Solution

If body is going up, then
μdownward=mgsin45+μmgcos45mg(12+0.52)g(12+122)=g(322)=4.9(32)=10.4m/s2
If body is going down, then
adown=gsin45=9.8×12=6.92m/s2

975019_1022132_ans_5b76324fa52947cca7dfef98102b599e.png

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