Question

a car decreases its speed from 80 km per hour to 60 km per hour in 5 second find the acceleration of the car​

Answer 1

GOOD MORNING!!

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