- #1
harambe
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Homework Statement
Figure shows two blocks in contact sliding down an inclined surface of inclination 30.The friction coeffecient between the block of mass 2kg and the incline is μ=0.20 and that between block of mass 4kg and the incline is μ=0.30.Find the acceleration of 4 kg block (g=10m/s2) (Angle of the incline is 30) (Coeffecient of friction as per the question,not by the diagram)
Homework Equations
[/B]The Attempt at a Solution
I thought that since there is friction acting therefore the accelerations will be different in these masses
For 4 kg
Force down the plane - Mgsinθ=40sin30=20N
Friction- μN=0.3X40cos30=10.32
a= Force-friction/mass
=20-10.32/4
=9.88/4
=2.47m/s2
But the answer is 2.7m/s2 so can anybody tell me what I did wrong
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