A bullet fired from a rifle travels at an average speed of 2520 km/hr. It hits the target after 0.2 seconds. How far (in metre) is the target from the rifle?

Options

A. 70
B. 140
C. 100
D. 200

Answer

To solve the problem step by step, we can follow these instructions:

### Step 1: Convert the speed from km/hr to m/s
The speed of the bullet is given as 2520 km/hr. To convert this speed into meters per second (m/s), we use the conversion factor where 1 km/hr is equal to \( \frac{1}{3.6} \) m/s.

\[ \text{Speed in m/s} = \frac{2520 \text{ km/hr}}{3.6} = 700 \text{ m/s} \]

### Step 2: Identify the time taken
The time taken for the bullet to hit the target is given as 0.2 seconds.

\[ \text{Time} = 0.2 \text{ seconds} \]

### Step 3: Use the formula for distance
The formula for distance is given by:

\[ \text{Distance} = \text{Speed} \times \text{Time} \]

### Step 4: Calculate the distance
Now, we can substitute the values we have into the distance formula:

\[ \text{Distance} = 700 \text{ m/s} \times 0.2 \text{ s} = 140 \text{ meters} \]

### Conclusion
The target is 140 meters away from the rifle.

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