Question

Water level in a well was 20m below ground level. During rainy season, rainwater collected in different water tanks was drained into the well and the water level rises 5m above the previous level. The wall of the well is 1m 20cm high and a pulley is fixed at the height of 80cm. Raghu wants to draw water from the well. What is the minimum length of wire he can use?
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Answer 1

Answer:

After water level rises 5 m above the previous level, water level is now (20 - 5) = 15 m below the ground level.

Height of the pulley from the ground level = 1 m 20 cm + 80 cm

= 1.2 m + 0.8 m

= 2 m

Therefore, the minimum length of the rope = 15 m + 2 m

= 17 m.

Ans. 17 m

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