Two blocks of mass \( 10 \mathrm{~kg} \) and \( 30 \mathrm{~kg} \) ...

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Two blocks of mass \( 10 \mathrm{~kg} \) and \( 30 \mathrm{~kg} \) are kept as shown in the figure. The surface between the
\( \mathrm{P} \) block is frictional while the ground is smooth.

W
A horizontal force of magnitude \( 60 \mathrm{~N} \) is applied
horizontally on the upper block. Find the frictional force on block of mass \( 30 \mathrm{~kg} \) ?
(1) \( 20 \mathrm{~N} \)
(2) \( 30 \mathrm{~N} \)
(3) \( 45 \mathrm{~N} \)
(4) \( 50 \mathrm{~N} \)
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