Question

the speed of the car changes from 5/18m/s to 18/5 km/h in 13s the magnitude of acceleration of the car is

Answer 1

acceleration = v-u /t

5/18-18/5/13

1/13

Answer 2

Acceleration is the rate of change of velocity

ACC=final vel- initial vel/total time taken

Initial velocity =5/18m/s

Final velocity =18/5*5/18m/s=1m/s

a=(5/18-1)/13

a=-(13/18)/13=-1/18