Question

A block of weight $50N$ is pulled $10$ meters across a level floor by the force of $40N$ directed at ${30}^o$ from the horizontal. $\left(\sin {30}^o=0.50,\cos {30}^o=0.87\right)$
Find out the work done on the block ?

• A. $160J$
• B. $200J$
• C. $350J$
• D. $400J$
• E. $1,600J$

Answer 1

Answer: (C)

$350J$

Given : $F=40$ N $S=10$ m $\theta ={30}^o$

Work done by force $F$

$W=FS$ $cos\theta =40\times 10\times 0.87\approx 350$ N