Question

Water level in a well was 20m below the ground level. During rainy season, rain water 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 1m20cm high and a pulley is fixed at a height of 80cm. Raghu wants to draw water from the well. What is the minimum length of the rope that he can use?

Answer 1

Answer:

Water level in a well was 20m below the ground level. During rainy season, rain water collected in different water tanks was drained into the well and the water level rises 5m above the previous level.

so  water level will be 20 - 5 = 15 m below the ground level

since the wall of the well is 1m20cm high , a pulley is fixed at a height of 80cm and  Raghu wants to draw water from the well,  the minimum length of the rope that he can use

= 15m +   1m 20 cm + 1m 20 cm( to pull downwards ) + 80cm + 80 cm( to pull downwards )

= 1500 cm + 120 cm *2 + 80 * 2 cm

=1900 cm

= 19 m (answer ) ( min )

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