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Two block (A) 2kg and (B) 5kg rest one o...

Two block (A) 2kg and (B) 5kg rest one over the other on a smooth horizontal plane. The cofficient of static and dynamic friction between (A) and (B) is the sae and equal to 0.60. The maximum horizontal force that can be applied to (B) in order that both (A) and (B) do not have any relative motion:

A

42N

B

42kgf

C

5.4kgf

D

1.2N

Text Solution

Verified by Experts

The correct Answer is:
A
`a=(F)/(7)` for block A
`2xx(F)/(7)=0.6xx2xx10`
F=42N
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