Question

A force of 5 N, making an angle $\theta$ with the horizontal, acting on an object displaces it by $0.4 m$ along the horizontal direction. If the object gains kinetic energy of 1J, the horizontal component of the force is

• A. 1.5 N
• B. 2.5 N
• C. 3.5 N
• D. 4.5 N

Answer 1

Answer: (B)

2.5 N

Answer 2

Work done on the body = K.E. gained by the body

$F s \cos \theta = 1$⇒$F \cos \theta$