Calculate the potential energy it gains.
A) \[1.96\,\,J\]
B) \[1.57\,\,J\]
C) \[7.84\,\,J\]
D) \[1.26\,\,J\]
Correct Answer: B
Solution :
\[P.E.=mgh=0.8\times 9.8\times 0.2\] \[=1.568\,\,J\]or\[1.57\,\,J\]
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