Question

. A Car travelling at 60 km/h uniformly retards for
10 s and attains a velocity of 45 km/h. Find the retardation
(Ans. 0.42 m/s)

Answer 1

Concept:

Retardation is the decrement in the velocity with respect to time. It can be calculated by using dividing change in velocity by time taken.

Given:

Initial velocity of car = 60 Km/hr

Final Velocity of car = 45 Km/hr

Time interval = 10 seconds

Find:

Retardation of the car

Solution:

Magnitude of Retardation = ( Initial velocity - Final velocity ) / time interval

Initial velocity of car is given as 60 Km/hr or 16.66 m/s

Final velocity of car is given as 45 Km/hr or 12.5 m/s

Magnitude of Retardation of car = (16.66 - 12.5) / 10  m/s²

Magnitude of Retardation of car = 4.16 / 10 m/s²

Magnitude of Retardation of car  = 0.416 m/s² or 0.42 m/s² (approximately)

Hence, The Magnitude of Retardation of car is 0.416 m/s² or 0.42 m/s² (approximately),

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