A) 37.5 J
B) 10 J
C) 45 J
D) 22.5 J
Correct Answer: C
Solution :
[c] \[\operatorname{W} = area of F - x graph\] \[=area\text{ }of\text{ }\Delta +area\text{ }of\text{ }rectangle+area\text{ }of\text{ }\Delta \] \[=\frac{5\times 3}{2}+10\times 3+\frac{5\times 3}{2}=45J\]
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