Initially whole system is at rest and now a force of 62 N is applied on block B as shown in figure.

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4-2.Friction

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Initially the whole system is at rest and now a force of $62\ N$ is applied on the block $B$ as shown in the figure. Find the time taken by $'A'$ to fall from the block $'B'$ ........... $\sec$

A

$\frac{8}{3}$

B

$3$

C

$4$

D

$5$

Solution

$\Rightarrow \mathrm{a}_{\mathrm{A}}=4 \mathrm{m} / \mathrm{s}^{2}(\mathrm{Right})$

$a_{B}=6 m / s^{2}(R i g h t)$

$a_{\mathrm{A} / \mathrm{B}}=2 \mathrm{m} / \mathrm{s}^{2}$ towards left

$\Rightarrow 16=\frac{1}{2} 2 \mathrm{t}^{2} \Rightarrow \mathrm{t}=4 \mathrm{sec}$

Standard 11

Physics

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