Kinematics Question 275
Question: A body, constrained to move in the Y-direction is subjected to a force given by $ \overrightarrow{F}=(-2\hat{i}+15\hat{j}+6\hat{k})N. $ What is the work done by this force in moving the body a distance 10 m along the Y-axis [CBSE PMT 1994]
Options:
A) 20 J
B) 150 J
C) 160 J
D) 190 J
Correct Answer: B $ W=\vec{F}.\vec{r} $ $ =(-2\hat{i}+15\hat{j}+6\hat{k})(10\hat{j})=150 $
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