A) 200 W
B) 100\[\sqrt{3}\]W
C) 50 W
D) zero
Correct Answer: A
Solution :
Power (P) is given as \[P=F.v=Fv\cos \theta \] where F is force, v the velocity and\[\theta \]the angle between F and v. \[P=mgv\text{ }cos\theta \] Given, \[m=2\text{ }kg,\text{ }v=20\text{ }m/s,\text{ }\theta =60{}^\circ \] \[\therefore \] \[P=2\times 20\times 10\times cos\text{ }60{}^\circ \] \[P=2\times 20\times 10\times 1\] \[\Rightarrow \] \[P=200\text{ }W\]You need to login to perform this action.
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