A boat of area `10m^(2)` floating on the surface of river is made to move horizontally with a speed of 2m/s by applying a tangential force. If the river is 1 m deep and the water in contact with the bed is stationary, find the tangential force needed to keep the boat moving with constant speed.
`("coefficient of viscosity of water "=10^(-2)" poise")`

Explanation

To solve the problem of finding the tangential force needed to keep the boat moving at a constant speed, we can follow these steps:

### Step 1: Understand the problem
The boat is floating on the surface of a river and is moving horizontally with a speed of 2 m/s. The water in contact with the riverbed is stationary. We need to find the tangential force required to maintain this constant speed.

### Step 2: Identify the given values
- Area of the boat, \( A = 10 \, \text{m}^2 \)
- Speed of the boat, \( v = 2 \, \text{m/s} \)
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