Kinematics Question 272
Question: A force $ \overrightarrow{F}=5\hat{i}+6\hat{j}+4\hat{k} $ acting on a body, produces a displacement $ \overrightarrow{S}=6\hat{i}-5\hat{k}. $ Work done by the force is [KCET 1999]
Options:
A) 10 unit
B) 18 unit
C) 11 unit
D) 5 unit
Correct Answer: A $ W=\bar{F}.\bar{s}=(5\hat{i}+6\hat{j}+4\hat{k})(6\hat{i}-5\hat{k})=30-20=10 $ J
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