Question

10. A force F = 5î+ 4j newton displaces
îa body
through S = 3 î + 4 k metre in 3 s. Find the
power.​

Answer 1

$\Huge{\textbf{\textsf{{\purple{Ans}}{\pink{wer}}{\color{pink}{:}}}}}$

First step : Find work by using W = FS

Second step : Find power by using P = W/t

First step :

W = FS = (5î+ 4j).(3 î + 4 k)

= 15 + 0 = 15 J

Second step:

Power P = W/t = 15/3 = 5 J/s = 5 W