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[" 65.A plank of mass "10kg" and a block...

[" 65.A plank of mass "10kg" and a block of mass "2kg" 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.The "],[0.5." A force of "60N" is applied on plank horizontally."],[" In first "2s" the work done by friction on the block is "],[qquad 10kg],[[" (a) "-100J," (b) "100J," (c) zero "," (d) "200J]]

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