Question

1.A bus decrease its speed form 80 km h-¹ to 60 km h-¹ in 5s. find the acceleration of the bus ​

Answer 1

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

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Answer 2

Answer:

The total distance traveled equals 20km +40km = 60km. Total time equals 1 hr + 3 hr = 4hr. Average speed equals total distance traveled divided by the total time, 60km / 4hr = 15km per hour