physics

a car travels 4km in 3 minutes.find the speed of car in cms-1

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  1. speed=4km/180sec=4000m/180s=400000cm/180 s

  2. Remember this d=s.t
    Where d stands for DISTANCE NOT DISPLACEMENT
    And s for SPEED NOT VELOCITY

    Way to remember : think about department of science and technology or Dust.

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  3. 5m/second

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  4. Speed=4 km
    Time=3min
    Speed=4 km×1000 m=4000
    =4000 m×100 m=400000
    Time=3 min ×60 sec=180
    Divide
    400000÷180=0.00045

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