A man displaces a box at a distance of 20m by applying 20N force. What is his work done? If he takes 2 sec time for the work, calculate power.
State the conditions under which a force does no work.
A boy standing for the whole day feels tired. Has he done any work? Why does he feel tired?
Calculate work done against friction when 5 kg mass is dragged about 5 m distance.
Find the work done by a boy if he applies the force of 5N to displace a book through 20 cm.
Calculate the work against gravity when 3 kg stone is raised by 3m.
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