Question

A force of 20N displaces an object through 10cm and does one joule work in this process .The angle between the force and displacement is :
(A) 0. degree
(B) 30 degree
(C) 45 degree
(D) 60 degree

Answer 1

we know that
work done =force.displacement
=force*displacement*cosβ...........i)
(β=angle between force and displacement)
given is,
work done = 1 joule
force = 20 N
displacement = 10 cm=0.1m
then,
by equation i)
1 joule = 20 N *0.1 m*cosβ
1 joule = 2 joule *cosβ
1/2 joule=cosβ
cos60°=cosβ
by comparing
β=60°

Answer 2

Answer:

option d) 60 degree.

I hope it will help u