Question

A force of $2\hat{i}+3\hat{j}+2kN$ acts on a body for 4 s and produces a displacement of $3\hat{i}+4\hat{j}+5\hat{k}m$ calculate the power ?

• A. 5 w
• B. 6 w
• C. 7 W
• D. 9 w

Answer 1

The correct option is C 7 W

Given that,

Force ,$F=2\hat{i}+3\hat{j}+2\hat{k}$ N

Displacement , $S=3\hat{i}+4\hat{j}+5\hat{k}$ m

Time Taken , $t=4s$

Power, $P=\frac{P}{t}=\frac{F\cdot S}{t}=\frac{6+12+10}{4}=\frac{28}{4}=7W$