Two rigid bodies of mass 5 kg and 4 kg are at rest on a frictionless surface until acted upon by a force of 36 N as shown in the figure

Q. Two rigid bodies of mass 5 kg and 4 kg are at rest on a frictionless surface until acted upon by a force of 36 N as shown in the figure. The contact force generated between the two bodies is

(A) 4.0 N                   

(B) 7.2 N                   

(C) 9.0 N                   

(D) 16.0 N

Ans: 16.0 N

Sol:

Given that the minimum force required to cause movement is 36 N.

The net mass of both the block as both the block moves together with the same acceleration (m) m = 5 + 4 = 9 kg