# 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

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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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