Question

Vijay is pulling a block with 22 N force and Gopal is pulling it with 10 N force in opposite direction. Vijay is able to pull the block to a distance of 6.5 m. The net work done is

• A. 12 J
• B. 90 J
• C. 85 J
• D. 78 J

Answer 1

The correct option is D 78 J

Let force applied by Vijay be $F_1$ and force applied by Gopal be $F_2$.
Given, force $F_1=22N$, $F_2=10N$ and displacement $S=6.5m$
Since, both the forces are acting in the opposite direction, net force$=22-10=12N$
Net work done,W = Net force $\times$ displacement = 12 $\times$6.5 = 78 J .
$\therefore$ The net work done is 78 J.