Question

While dragging or lifting an object, negative work is done by. Choose one or more correct alternatives.
(i) the applied force
(ii) gravitational force
(iii) frictional force(iv) reaction force

Answer 1

while dragging its the frictional force 
and while lifting it is the gravitational force
so option 2 and 3 are correct 
hope it helps 

Answer 2

Dear Student,

◆ Answer -

(ii) gravitational force

(iii) frictional force

● Explaination -

• Work done is negative when displacement is in opposite direction of the external force.
• While dragging an object, frictional force provides resistance in opposite direction. Hence, work done is negative.
• When we lift an object, gravitational force tries to pull it down. Hence, work done is negative.

Thanks dear. Hope this helps you...