an insect crawling up a wall crawls 5cm upwards in the first minute but then slides 3cm downwards in the next minute.It again crawls up 5cm upwards in the third minute but again slides 3cm downwards in the fourth minute.How long will the insect take to reach a crieve in the wall at a height of 24cm from its starting point?How does the position-time graph of the insect look like?
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In every two minutes, the insect climbs 5 cm & slides 3 cm. So total progress in per two minutes is 5-3 = 2 cm. ... In 21st minute, the insect will climb 5 cm, making total climbing 20+5 = 25 cm. Therefore, the insect will climb up wall of 25 cm in 21 minutes.
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