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, \[W=f\times {{S}_{3rd}}=4\times 0.5=25\,\,J\]You need to login to perform this action.
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