question_answer

A block A of mass 1 kg is placed on the rough surface of a trolley as shown in the figure. At \[t=0,\]the trolley starts moving   from rest with an acceleration of\[5\text{ }m/{{s}^{2}}\]. What is the work done (in Joule) by friction on the block in ground reference frame till \[t=2\sec \]? (take \[{{\mu }_{s}}=0.5,\,{{\mu }_{k}}=0.4\] and \[g=10m/{{s}^{2}}\])

Answer:

50