Two blocks (A) \( 2 \mathrm{~kg} \) and (B) \( 5 \mathrm{~kg} \) rest one over the other on a sm...

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Two blocks (A) \( 2 \mathrm{~kg} \) and (B) \( 5 \mathrm{~kg} \) rest one over the other on a smooth horizontal plane. The coefficient of static and dynamic friction between (A) and (B) is the same and equal to \( 0.60 \). The maximum horizontal force \( \mathrm{F} \) that can be applied to \( (\mathrm{B} \) ) in order that both (A) and (B) do not have any relative motion is :
(1) \( 42 \mathrm{~N} \)
(2) \( 42 \mathrm{kgf} \)
(3) \( 5.4 \mathrm{kgf} \)
(4) \( 1.2 \mathrm{~N} \)
\( \mathrm{W} \)
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