Question

Water level in well was 20 m below ground level. During rainy season, rain water collected in different water tanks was drained into well and water level rises 5 metre above the previous level . . The wall of well is 1 m 20 cm high and a Pulley is tied at a height of 80 CM. Raghu wants to draw water from the well the minimum height of the rope that can cause is

a. 17 m b. 18 m c. 96 cm d. 97 cm

Answer 1

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Correct option is A 17 m

we have been given that,

Wells height=1.20m

Pulleys height=0.80m

Hence, the required ropes length

=(20−5+1.20+.80)

=(15+2)

=17m

Therefore, the minimum length of the rope is 17m.

Hope it will help you