Application of Newtons laws

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Question

A block B of mass 1 kg is placed on a light plank shown in figure. A force F of 10 N is applied on the plank horizontally. Find the acceleration (in m/s²) of block B.

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Solution

$Here, F = 2 T (from FBD of pulley)$
$\begin{array}{l} ∴ T = 5 N \\ But, T = m a \\ ∴ a = \frac{T}{m} = \frac{5}{1} = 5 m / s^{2} \end{array}$

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