Question

A bus decreases its speed from 80km per hour to 60 km per hour in 5 minutes find acceleration of bus

Answer 1

u = 80 km/h = 80×5/18 m/s = 200/9 m/s

v = 60 km/h = 60×5/18 m/s = 150/9 m/s

t = 5 minutes = 5×60 s = 300 s

As v = u + a t

so , 150/9 = 200/9 + a × 300

or, -50/9 = 300a

so , a = -1/54 m/s^2 = - 0.0185 m/s^2

Answer 2

u = 80 km/h = 80×5/18 m/s = 200/9 m/s

v = 60 km/h = 60×5/18 m/s = 150/9 m/s

t = 5 minutes = 5×60 s = 300 s

As v = u + a t

so , 150/9 = 200/9 + a × 300

or, -50/9 = 300a

so , a = -1/54 m/s^2 = - 0.0185 m/s^2