A plank of mass 10 kg and a block of mass 2 kg are placed on a horizontal plane as shown in the figure. There is no friction between plane and plank. The coefficient of friction between block and plank is 0.5. A force of 60 N is applied on plank horizontally. In first 2 s, the work done by friction on the block is
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Maximum acceleration of 2 kg block due to friction can be 
or 
.
Combined acceleration, if both move together with same acceleration, would be 
Since, both accelerations are equal, upper block will move with acceleration 
due to friction.
In first two seconds,
and force of friction, 
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