1) The air in a bicycle tyre is released because of punter2)A ball is dropped and falls to the ground3)a box is moved at constant speed across a smooth horizontal surface4) a crane lifts a steel girder at constant speed
the optimum speed of a falling merchandise is that is terminal speedthat's while the downward stress of gravity precisely equals the upward stress of air resistance, so there is not any internet stress on the article, and it falls at a relentless speedThe previous fact that cats continually seem to land on their ft has to do with the cat's terminal speedwhile falling from an remarkable top (say, 5 thoughts), the cat can unquestionably exchange that is terminal speed via spreading that is legs to boost that is air resistance, subsequently slowing it downthey might unquestionably fall from very extreme and run away unscathed.
2For answers 3 and 4, work is obviously being performedFor answer 1, the work is the puncture of the tire to release the air pressure.
