Question

02. A force (4î +j
-2kN acting on a body
maintains its velocity at (2î +2j + 3k )ms-1.
The power exerted is
a) 4W b) 5W c) 2W d) 8W
e) 1W​

Answer 1

power = force*velocity=(4*2+1*2+-2*3)=8+2-6=4j/s