a car travelling with a speed of 20km/hr comes into rest in 0.5hrs.What will be the value of its retardation
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Answer: Information provided to us:
Initial velocity, u = 20 km/h
Final velocity, v = 0 km/h
Time, t = 0.5 hours
Hence,
Acceleration, a = ( v - u ) / t
a = ( 0 - 20 ) / 0.5
a = - 20 / 0.5
a = - 200 / 5
a = - 40 km/h^2
We know that negative acceleration is retardation so,
Retardation, r = - a
r = - ( - 40 )
Retardation = 40 km / h ^ 2
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