Question

A car travelling with a velocity of 80 km/h slowed down to 44 km/h in 15 s. The retardation is

Answer 1

Initial Velocity = 80 km/h
Final Velocity = 44 km/h
Time = 15 seconds
Acceleration/Retardation = 44-80 divided by 15 = -36/15 = -2.4
The retardation is 2.4

Answer 2

Hello friend
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Initial velocity of the car is 80kmph

80×5/18=200/9 m/sec

It slowed down to 44kmph

44×5/18=110/9 m/sec

Time taken is 15sec

Retardation is [(200/9)-(110/9)]÷15

=(90/9)÷15

=10/15=0.666...=0.67m/s^-2
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Hope it helps!