Question

block of mass M1 = 8 kg the bar of mass entry question 2kg placed on a rough surface lie on the smooth flow of elevator extending with an acceleration G by for the coefficient of friction of is 1 by 5 between M1 and M2 and the plant​

Answer 1

Answer.-

let the frictional force between plank and bar is f

f=µN

N=pseudo force+weight of the bar

=20+2g/4=25N

f=25x1/5 = 5N

acceleration of the bar = force on bar/mass of bar = frictional force/mass

=5/2

=2.5m/s2

acceleration of the plank=30-5/8

=25/8 m/s2

Thanks