A man carefully brings a glass sheet from a height of 2m to ground . find the work done.
Dear student,
when the man brings the glass downwards he applies a force of mg,
where m is mass of glass
and g is acceleration due to gravity
on the glass in an upward direction to balance the weight of the glass as the displacement is downwards so the angle between the displacement and force will be 180 so the work done will be given by mg.d, as here d = 2m and angle is 180 so work done will be
-2mg.
Regards
when the man brings the glass downwards he applies a force of mg,
where m is mass of glass
and g is acceleration due to gravity
on the glass in an upward direction to balance the weight of the glass as the displacement is downwards so the angle between the displacement and force will be 180 so the work done will be given by mg.d, as here d = 2m and angle is 180 so work done will be
-2mg.
Regards