Under which conditions is work done
A
A man supports a heavy load on his head with hands.
B
A woman holds a pot of water
C
A boy climbs onto a table
D
A man pushes against a stationary petrol tanker
Verified Correct Answer: C.
Step-by-Step Mathematical Solution
Work is done when a force causes an object to move in the direction of that force. OPTION C. A boy climbs onto a table.
Work done (force is applied to lift himself).
when a boy climbs onto a table, he exerts a force to lift his body against gravity. As he moves upward, he is doing work because there is a displacement in the direction of the applied force. Thus, work is done in this case.
Source: WAEC / JAMB / NECO Classroom Archive (Record #70352)