A) 10 unit
B) \[122\sqrt{5}\] unit
C) \[5\sqrt{122}\] unit
D) 20 unit
Correct Answer: A
Solution :
Work done\[=\overset{\to }{\mathop{\mathbf{F}}}\,\cdot \overset{\to }{\mathop{\mathbf{s}}}\,\] \[=(5\widehat{\mathbf{i}}+3\widehat{\mathbf{j}}+4\widehat{\mathbf{k}})\cdot (6\widehat{\mathbf{i}}-5\widehat{\mathbf{k}})\] \[=(5\widehat{\mathbf{i}}+3\widehat{\mathbf{j}}+4\widehat{\mathbf{k}})\cdot (6\widehat{\mathbf{i}}+0\widehat{\mathbf{j}}-5\widehat{\mathbf{k}})\] \[=(30+0-20)=10\,\,unit\]
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