the air in a bicycle tyre is released because of a puncture2.a ball is dropped and falls to ground3.a box is moved at constant speed across smooth horizontal surface.4.a crane lifts a steel girder at constant speedi'll be really grateful if you answer in detail about each of the situation.
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2 When a ball is dropped from the some distance above the ground , the ball at initially contain potential energy, after that it acquires kinetic energysince energy and work done is sameIn this situation work is done3actually force displacement is also work donein this case to move a box with constant speed some force is required and due to that force there is displacement of boxso work is done in this case also4crane has to lift the steel grider against gravity so work is done in this case also.
