Question

Figure shows two blocks in contact sliding down as inclined surface of inclination 30 degree. The friction coefficient between the block of mass 2 kg and the incline is u1, and that between the block of mass 4 kg and the incline is u2. Calculate the acceleration of 2 kg block if u1= 0.20 and u2= 0.30.
Take g =10m/s2

Answer 1

a = 2.7 m/s²

Answer 2

right answer @Vincent-Lyon.Fr

Answer 3

So, express friction forces for each block, then consider both blocks as a single block and apply N's 2nd law.