1.

A block of mass m is placed behind in contact with vertical side of M as shown in the figure. The coefficient of static friction between m and M in mu. The least horizontal force with which m can be pushed so that the two blocks move together is (neglect friction between M and ground).

Answer»

SOLUTION :
ACCELERATION of be system `a=(F)/(m+M)`
Normal reaction between the blocks is
`N=(MF)/(M+m)`
When .. is in equilibrium `mg LE mu N`
`mg le mu (MF)/((M+m)) RARR F GE (mg(M+m))/(mu M)`
The minimum force `F=(mg(M+m))/(mu M)`


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