An engine pumps 400 kg of water through height of 10 m in 40 s. Find the power of the engine if its efficiency is 80% (Take ,g =10 `ms^(-2)`).

Explanation

To solve the problem step by step, we will follow these calculations:

### Step 1: Calculate the Work Done
The work done by the engine to pump the water can be calculated using the formula:
\[ \text{Work Done} (W) = mgh \]
Where:
- \( m = 400 \, \text{kg} \) (mass of the water)
- \( g = 10 \, \text{m/s}^2 \) (acceleration due to gravity)
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