Question

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

• A. $42N$
• B. $84kgf$
• C. $5.4kgf$
• D. $1.2N$

Answer 1

The correct option is A $42N$

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