A) 1.2 J
B) 2 J
C) 4 J
D) 16 J
Correct Answer: B
Solution :
Here, \[a=\frac{f}{m}=\frac{4}{20}=\frac{1}{5}m/{{s}^{2}}\] Distance travelled by body in 3rd second \[{{S}_{3rd}}=0+\frac{1}{5\times 2}(2\times 3-1)\] \[=0.5\,m\] Hence, work done, \[W=f\times {{S}_{3rd}}\] \[=4\times 0.5=25\,J\]
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