A) 200 J
B) 100 J
C) 300
D) 250 J
Correct Answer: D
Solution :
\[W=\overrightarrow{F}\,.\,\overrightarrow{S}=FS\cos \theta \] \[=50\times 10\times \cos 60{}^\circ =50\times 10\times \frac{1}{2}=250\,J.\]
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