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Question

A water tank on the top of a building 25 m high, contains 100 kg of water. Calculate the potential energy stored in the water. [Take acceleration due to gravity 10 ms-2]


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Solution

Step 1: Given data:

Height of the building is h = 25 m.

Mass of water contained in the tank is m = 100 kg.

Acceleration due to gravity is g = 10 m/s2

Step 2: Formula used:

According to the formula,

P.E. = mass x acceleration due to gravity x height

P.E. = m x g x h

Where P.E. is the potential energy.

Step 3: Calculation:

Finding the potential energy:

Substituting the known values,

P.E. = (100 kg) x (10 m/s2) x (25 m)

P.E. = 25000 J

Hence, the potential energy stored in the water is 25000 J.


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