JEE Main Physics question
In a certain situation, **F** and **s** are not equal to zero, but the work done is zero. From this we conclude that
Answer: (C)
Solution
W = Fs cosθ = 0 with F≠0, s≠0 requires cosθ = 0, i.e., θ = 90°: **F** and **s** are perpendicular.