Two spherical balls of mass 1 kg and 4 kg are separated by a distance of 12 cm. Find the distance from 1 kg at which the gravitational force on any mass becomes zero.

Explanation

To find the distance from the 1 kg mass at which the gravitational force on any mass becomes zero, we can follow these steps:

### Step-by-Step Solution

1. **Identify the masses and the distance between them**:
- Let \( M_1 = 1 \, \text{kg} \) (mass of the first ball)
- Let \( M_2 = 4 \, \text{kg} \) (mass of the second ball)
- The distance between the two masses is \( d = 12 \, \text{cm} = 0.12 \, \text{m} \).
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