Question

a car decreases its speed from 80km/hr to 60kh/hr in 5 seconds. find thevacceleration of the car in SI unit​

Answer 1

Acceleration of car is = Change in velocity/ Time taken to change its velocity.

Change in velocity = ( 80 - 60 )km/hr = 20km/hr = 20×5/18 m/s = 100/18 m/s = 50/9m/s

Time taken to change its velocity is = 5sec

So, it's Acceleration is =

50/45 = 10/9 m/s²

OR

Acceleration of car is =

20/5 km/s² = 4km/s²

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