Question

A force of $7N$, making an angle $q$ with the horizantal, acting on an object displaces it by $0.5m$ along the horizontal direction. If the object gains kinetic energy of $2J$, what is the horizontal component of the force?

• A. $2N$
  
• B. $4N$
  
• C. $1N$
  
• D. $14N$
  

Answer 1

The correct option is B $4N$

Let the force in horizontal direction be F

By work energy theorem

Gain in KE=Work done

$\Rightarrow 2=F.s=F\times 0.5$

$\Rightarrow F=4N$

Hence correct answer is option $C$