MHT CET · Physics · Work Power Energy
A constant force \(\overrightarrow{\mathrm{F}}=3 \hat{\mathrm{i}}-2 \hat{\mathrm{j}}-\hat{\mathrm{k}}\) newton has a displacement \(\vec{r}=2 \hat{i}-3 \hat{j}-3 \hat{k}\) metre in 2 second. The work done and the power are respectively
- A 20 joule , 10 watt
- B 15 joule, \(7 \cdot 5\) watt
- C 13 joule , \(6 \cdot 5\) watt
- D 10 joule , 5 watt
Answer & Solution
Correct Answer
(B) 15 joule, \(7 \cdot 5\) watt
Step-by-step Solution
Detailed explanation
Work done: \(W = \vec{F} \cdot \vec{r}\) \(W = (3)(2) + (-2)(-3) + (-1)(-3)\)
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