The earth attracts a body of mass 1 kg with a force of 10 N. The mass of a boy is 50 kg. His weight will be :

Options

A. 50kg
B. 500N
C. 50N
D. 5N

Answer

To find the weight of the boy, we can use the formula for weight, which is given by:

\[ W = M \times g \]

where:
- \( W \) is the weight,
- \( M \) is the mass of the object,
- \( g \) is the acceleration due to gravity.

### Step-by-Step Solution:

1. **Identify the mass of the boy**:
The mass of the boy is given as \( M = 50 \, \text{kg} \).

2. **Identify the value of \( g \)**:
From the question, we know that the Earth attracts a body of mass 1 kg with a force of 10 N. This means that the acceleration due to gravity \( g \) is \( 10 \, \text{N/kg} \) (or \( 10 \, \text{m/s}^2 \)).

3. **Substitute the values into the weight formula**:
Now we can substitute the values into the weight formula:
\[ W = M \times g = 50 \, \text{kg} \times 10 \, \text{N/kg} \]

4. **Calculate the weight**:
\[ W = 50 \times 10 = 500 \, \text{N} \]

5. **Conclusion**:
The weight of the boy is \( 500 \, \text{N} \).

### Final Answer:
The weight of the boy will be **500 N**.

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