Question

A force of 5 N, making an angle `theta` with the horizontal, acting on an object displaces it by 0.8 m along the horizontal direction. If the object gains kinetic energy of 1 J, the horizontal component of the force is ____________.

विकल्प

• 1.5 N

• 1.25 N

• 2.5 N

• 4.15 N

Answer 1

A force of 5 N, making an angle `theta` with the horizontal, acting on an object displaces it by 0.8 m along the horizontal direction. If the object gains kinetic energy of 1 J, the horizontal component of the force is 1.25 N.

Explanation:

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

Fs cos `theta` = 1 J

`therefore "F cos"  theta = 1/"s" = 1/0.8 = 1.25  "N"`