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KCET2014PhysicsRotational Motion

A car moves from A to B with a speed of ( 30 kmph ) and from B to A with a speed of ( 20 kmph ). What is the average speed of the car ?

Options

  1. A( 25 kmph )
  2. B( 24 kmph )
  3. C( 50 kmph )
  4. D( 10 kmph )

Correct answer

B. ( 24 kmph )

Step-by-step solution

Given, speed of car from A to B =30 kmph ⁻¹=v₁ Speed of car from B to A=20 ~km h⁻¹=v₂ Average speed of car = 2 v₁+v₂ v₁+v₂ = 2 30 20 30+20 = 1200 50 =24 Average speed of car =24 kmph

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