Question

a bus decrease its speed from 80 km/h to 60 km/h in 5 seconds find the acceleration

Answer 1

INITIAL VELOCITY, u = 80 km/h = 80 * 1000/3600 m/s = 22.22 m/s
FINAL VELOCITY, v = 60 km/h = 60 * 1000/3600 m/s = 16.66 m/s
TIME = 5 sec

THEREFORE, ACCELERATION = (v - u) / t
                                                = ( 16.66 - 22.22 ) 5
                                                = - 5.56 / 5
                                                = - 1.112 m/s^2