A) \[-\,0.5\text{ }J\]
B) \[-1.25\text{ }J\]
C) \[1.25\text{ }J\]
D) \[0.5\text{ }J\]
Correct Answer: B
Solution :
The height (h) traversed by particle while going up is \[h=\frac{{{u}^{2}}}{2g}=\frac{25}{2\times 9.8}\] Work done by gravity force\[=m\overrightarrow{g}\cdot \overrightarrow{h}\] \[=0.1\times g\times \frac{25}{2\times 9.8}\cos 180{}^\circ \] [Angle between force and displacement is\[180{}^\circ \]] \[\therefore \] \[W=-\,0.1\times \frac{25}{2}=-1.25\,J\]You need to login to perform this action.
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