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Physics · MOTION IN A STRAIGHT LINE

हिन्दी

A car covers the first half of a total distance at a speed of \( 30\text{ km/h} \) and the second half of the distance at a speed of \( 60\text{ km/h} \). The average speed of the car for the entire journey is:

  1. \( 40\text{ km/h} \)
  2. \( 45\text{ km/h} \)
  3. \( 50\text{ km/h} \)
  4. \( 36\text{ km/h} \)

Correct answer · Option 1

\( 40\text{ km/h} \)

Explanation

For equal distances, harmonic mean formula applies: \( v_{\text{avg}} = \frac{2 v_1 v_2}{v_1 + v_2} = \frac{2 \times 30 \times 60}{30 + 60} = \frac{3600}{90} = 40\text{ km/h} \).

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