The mass of a block made of certain material is 13.5 kg and its volume is `15 xx 10^(-3) m^3`.
Calculate upthrust on the block if it is held fully immersed in water.

Explanation

To calculate the upthrust (or buoyant force) on a block when it is fully immersed in water, we can use Archimedes' principle. According to this principle, the upthrust on a body immersed in a fluid is equal to the weight of the fluid displaced by the body.

### Step-by-Step Solution:

1. **Identify the given values:**
- Mass of the block, \( m = 13.5 \, \text{kg} \)
- Volume of the block, \( V = 15 \times 10^{-3} \, \text{m}^3 \)
- Density of water, \( \rho_{\text{water}} = 1000 \, \text{kg/m}^3 \)
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