STANDARDPhysics-Work, Energy and Power
STANDARD Physics Power MCQ Question
Type: MCQ-numerical-Medium-Class 11
A force (4î + ĵ - 2k̂) N acting on a body maintains its velocity at (2î + 2ĵ + 3k̂) m s⁻¹. The power exerted is
A
4 W
B
5 W
C
2 W
D
8 W
Correct Answer
Option A
Detailed Explanation
The power exerted is calculated using the dot product of force and velocity: P = F·v = (4î + ĵ - 2k̂) · (2î + 2ĵ + 3k̂) = 8 + 2 - 6 = 4 W.
Found an issue with this question?