Question

Ali and his friend sat together in the library for their exam preparation. Do you think they did any work from a scientific point of view?

Answer 1

Answer:

No , didn't do any work from a scientific point of view as they sat they were in a vertical position( 90 degree ). Therefore

$w \: = f \: \times s \: \times \cos( \alpha ) (work \: done \: at \: angle)$

w = f × s cos (90 degree)

Therefore work done = 0 [ As cos (90 degree)]