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 what?
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Explanation:
Answer :
B
Solution :
(b) Maximum acceleration of 2 kg block due to friction can be
. <br> Combined acceleration, if both move together with same acceleration would be, <br>
<br> Since, both accelerations are equal, upper block will move with acceleration
due to friction. <br> In first two seconds,
<br> and force of friction, f=ma=10 N <br>
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Answer:
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