The masses of blocks A,B,and C are 1kg, 2kg,and 0.5kg, respectively. All surfaces are smooth. If force `F=50N` acts as shown in fig. at the instant shown, find the force which A exerts on B and the acceleration of C.

Explanation

Block C will not move and blocks A and B will move with common acceleration
`a_(A)=a_(B)=(50)/((1+2))=(50)/(3) ms^(-2)`
From free body diagram of B
`N=m_(B)a_(B)=2 xx 50/3 = 100/3 N`.