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
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