Question

work done is zero if the angle between force acting on a body and displacement of the body is ?
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Answer 1

Answer:

90°

Explanation:

work done =force×displacement cosA

where A is angle between force and displacement

Answer 2

Answer:

90°

Explanation:

it is because the formula for work done (w) = force (f) x displacement (d) x cos Ɵ

w = f x d x cos Ɵ

w = f x d x cos 90°                             [but cos 90° = 0]

therefore,

for the work to be 0 the angle between two objects should be 90°