Assuming that no energy is lost otherwise, what is the gain in the P.E. of the block?
A) \[30J\]
B) \[20J\]
C) \[300J\]
D) \[600J\]
Correct Answer: C
Solution :
\[W=F\sin \theta \times S=mg\sin \theta \times S\] \[=20\,\,kg\times 10\,\,m\,\,{{s}^{-2}}\times \sin {{30}^{o}}\times 3\] \[=20\times 10\times \frac{1}{2}\times 3=300\,\,J\]
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