Question

A force of $7N$, making an angle with the horizontal, acting on an object displaces it by $0.5m$ along the horizontal direction. If the object gains K.E. of $2J$, what is the horizontal component of the force? (in N)

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

Answer 1

Answer: (B)

$4$

Let force of 7N be acting at angle θwith horizontal direction. Since displacement is in horizontal direction therefore only horizontal component of force will perform work.

By Work Energy theorem

Work done on body = Change in Kinetic Energy