A small block of mass \( 20 \mathrm{~kg} \) rests on a bigger block of mass \( 30 \mathrm{~kg} \....

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A small block of mass \( 20 \mathrm{~kg} \) rests on a bigger block of mass \( 30 \mathrm{~kg} \), which lies on a smooth horizontal plane. Initially the whole system is at rest. The coefficient of friction between the blocks is 0.5 A horizontal force \( F \) \( =50 \mathrm{~N} \) is applied on the lower block. Find the work done (in \( \mathrm{J} \) ) by frictional force on upper block in \( t=2 \) sec.


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