A boat containing some piece of material is floating in a pond. What will happen to the level of water in the pond if on unloading the pieces in the pond, the piece (a) floats, (b) sinks?

Explanation

To solve the problem, we will analyze the two scenarios separately: when the piece of material floats and when it sinks.

### Step-by-Step Solution:

1. **Understanding the Initial Situation**:
- A boat is floating on a pond with a piece of material inside it. The boat and the material together displace a certain volume of water, which corresponds to the weight of the boat plus the weight of the material.

2. **Case (a): The Piece Floats**:
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