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27. A block of mass 2 kg is resting on a horizontaltable. A force of 10 N is applied for 4 s on theblock in the horizontal direction. If g 10 ms2,and the cofficient of kinetic friction between theblock and the table- 0.2, then the work done bythe net force is.(a) 144J (b)96J (c) 72J (d) 36J

Answer»

Friction force= 4N

APPLIED FORCE= 10 N

NET FORCE= 10N-4N= 6N

acceleration of block= 6N/2kg= 3m/s2

distance travelled in 4 second= 24 m

WORK DONE BY APPLIED NET FORCE= 6N X 24m=144JOption (A)



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