You are provided with a hollow iron ball A of volume `15 "cm"^3` and mass 12 g and a solid iron ball B of mass 12 g. Both are placed on the surface of water contained in a large tub.
Find upthrust on each ball.

Explanation

To find the upthrust (buoyant force) on each ball when they are placed in water, we can follow these steps:

### Step 1: Understand the concept of upthrust
Upthrust (or buoyant force) is the upward force exerted by a fluid on an object that is submerged in it. According to Archimedes' principle, the upthrust is equal to the weight of the fluid displaced by the object.

### Step 2: Calculate the upthrust on hollow iron ball A
1. **Given data for ball A:**
- Volume of ball A (V_A) = 15 cm³
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