Question

A boy carries a load of 100 N to a horizontal distance of 100 m. The work done by the body is:

• A. 9800 Nm
• B. 0 Nm
• C. 1 Nm
• D. 1000 Nm

Answer 1

The correct option is B 0 Nm

$Workdone=Force\times displacement$

$Forceinthedirectionofmotion=0N$

$Distance=100m$

$\therefore Workdone=0\times 100=0N-m$

Work done by the object = force applied by the object x distance moved in the direction of the force. Force applied by the body = its weight. Direction - vertically downwards. Distance moved = 100 m. Since this is the horizontal distance, distance moved in the direction of the force = 0. Hence, the work done by the object is zero.