A) 3.75 J
B) 37.5 J
C) 0.375 J
D) 0.75 J
Correct Answer: A
Solution :
According to energy conservation, change in kinetic energy appears in the form of heat (thermal energy). Þ i.e. Thermal energy \[=\frac{1}{2}m(v_{1}^{2}-v_{2}^{2})\] \[\left[ \because \,\underset{\text{(Joule)}}{\mathop{W}}\,=\underset{\text{(Joule)}}{\mathop{Q}}\, \right]\] \[=\frac{1}{2}(100\times {{10}^{-3}})({{10}^{2}}-{{5}^{2}})=3.75\,J\]
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