- #1

harambe

- 50

- 10

## 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

[/B]