Question

A bus decreases its speed from 80 km h −1 to 60 km h −1 in 5 s. Find the acceleration of the bus.



Answer


Initial speed of the bus, u = 80 km/h

SO WHY ARE WE MULTIPLYING 80 FROM 5/18 IN INTIAL SPEED OF THE BUS (U) ?????

Answer 1

Initial velocity u = 80 km h-1



Final velocity u = 60kmph



Time  t= 5s   ,      a =?



The acceleration of bus is -1.11 m s-2

Answer 2

heyy user ur answer.........

u= initial velocity= 80 km/h = 22.2 m/s
v= final velocity = 60 km/h = 16.7 m/s
t= time = 5 s
a= acceleration = ?

a=v-u/t
a= 16.7-22.2/5
a= -5.5/5
Therefore, a=-1.1 m/s^2

we multiply by 5/18 because for conversion of km/hr to m/s.........


Hope it helps u...@kundan