Question

If a force of 25 N acts on a body for 4 s and displaces it by 5 m, then the work done is joules, and the power is watts.

• A. 25.65
• B. 150
• C. 125
• D. 31.25

Answer 1

Answer: (C), (D)

31.25

Given: Force, $F=25N$
Displacement, $S=5m$
Time interval, $t=4s$
$\text{Work done},W=\text{Force}\times \text{Displacement}$$⟹W=25\times 5=125J$.
Power = $\frac{\text{Work}}{\text{Time taken}}$ = $\frac{\text{W}}{\text{t}}$ $=\frac{125}{4}=31.25W$.