JEE Main Physics question

Physics Work, Energy and Power JEE Main

A force (4î + ĵ − 2k̂) N acting on a body maintains its velocity at (2î + 2ĵ + 3k̂) ms⁻¹. The power exerted is

(A)4 WCorrect
(B)5 W
(C)2 W
(D)8 W

Answer: (A)

Solution

P = F·v = (4)(2) + (1)(2) + (−2)(3) = 8 + 2 − 6 = 4 W.

Question ID VK-153983