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

Show Answer

Answer:

Correct Answer: B

Solution:

$ W=\vec{F}.\vec{r} $

$ =(-2\hat{i}+15\hat{j}+6\hat{k})(10\hat{j})=150 $



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